According to scientists, people are genetically more similar to their

Question

According to scientists, people are genetically more similar to their friends than  strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing  them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides

bb · Accepted Answer

Official Explanation by eGMAT:

Meaning Analysis      According to scientists, people are genetically more similar to their friends than strangers of the same population, 
  but what is much more interesting to know are
   that the genes controlling immunity to certain diseases are different between friends, 
  and this difference reduces the spread of disease,
   providing them an evolutionary advantage for befriending those with different immunities.

The sentence begins by presenting a comparison. However, this comparison is ambiguous. Let’s see how. The sentence says that people are genetically more similar to friends. This part is fine. Then the sentence says, “than strangers of the same population”. Now here is it difficult to understand whether “people” have been compared to “strangers” or whether “friends” have been compared to “strangers”. 
Then the sentence says that something else is more interesting than this comparison. The more interesting thing to know is that the genes that control immunity to certain diseases are different between friends. Another interesting thing to know is that this difference just mentioned reduces the spread of disease and as a result provides the friends an advantage to make friends with those who have different immunities.

Error Analysis      As already mentioned in the meaning analysis, this sentence has comparison error as it presents ambiguous comparison. Two comparisons can be inferred here:
   First Comparison – People are more similar to their friends than they are to strangers. Entities Compared – “friends” and “strangers”. 
  Second Comparison – People are more similar to their friends than strangers are to friends. Entities Compared – “people” and “strangers”.     The clause “what is much…” acts as a Subject and hence, must take Singular Verb. Plural Verb “are” leads to SV number agreement error. 
  Since two things are more interesting than the mentioned similarity, these two points must be grammatically and logically parallel to each. However, this is not the case. The first entity “that the genes…” is not parallel to “this difference…”. The second entity should also start with “that”.

Answer Choice Analysis

Choice A - Incorrect   
This choice has the errors pointed out in error analysis.

Choice B - Incorrect

This choice corrects the comparison error, the SV number agreement error, and the parallelism error of the original sentence.  
  However, it introduces another error. 
   This choice has a forced parallel list, the entities of which are “reduces” and “provides”.  
  Per the intended meaning, these actions are not independent of each other.  
  The second action is actually the result of the first action.

Choice C - Incorrect   
 
   This choice repeats the ambiguous comparison error and the SV number agreement error of Choice A. 
  “Again, use of “to provide” is not correct because to provide an evolutionary advantage is not the intent of the action denoted by “reduces” but is the result of that action.

Choice D - Correct   
   This choice corrects all the errors of the original sentence without introducing any new error.

Choice E - Incorrect   
   This choice repeats the parallelism error of Choice A. 
  Providing evolutionary advantage is the result of the action denoted by “reduces” in the original sentence. 
   This meaning has been changed in the choice.  
  Per this choice, the difference that reduces the spread of disease provides the evolutionary advantage. 
   There is no cause and effect relationship between the two actions.

Shrinidhi · Answer

According to scientists, people are genetically more similar to their friends than  strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing  them an evolutionary advantage for befriending those with different immunities.

Here in the original sentence, the S-V agreement "what is much more interesting to know are.." is incorrect as it should have been "what is much more interesting to know is...".So, options  A  and  C  are incorrect.

and the last statement after the comma should contain a subject in order to make it a independent clause (which option  E  has omitted) so we are left with options  B  and  E .
In option B it incorrectly makes the last statement independent clause in continution to previous which is incorrect i.e it has modifier error, Option  D  coorectly uses "providing" to modify the entire previous clause.

LoneSurvivor · Answer

IMO D

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing.
  We need   to   for maintaining parallelism.

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides.
 S-V agreement okay but and provides at the end is not showing the result.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide
 We need to for maintaining parallelism .
D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing
 Perfect everything is Ok

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides.
 Not parallel.

Lampard42 · Answer

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing -  to strangers is required to maintain parallelism to their friends

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide - -  to strangers is required to maintain parallelism to their friends

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing -  Correct, providing gives additional information as a modifier

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides -  and this refers to the entire previous clause - not acceptable

linhpkd96 · Answer

Here’s my explanation:

Q: According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

1. ...more similar TO their friends than TO strangers —> need parallel structure here —> eliminate choice A and C.

Analyse the rest: they differ in the form of the verb “provide”

B. ...provides: incorrect as the difference in immune system seem not to be able to provide people with advantage for befriending with people with different immunity (it may, but it is not said that it would, there’s no direct linking)

D. ..., providing —> correct, as this means that the act (or fact) that   will provide benefit for making friend with people of different immunity.

E. Incorrect, as saying “the difference reducing (which reduces) the spread of disease provides...” makes no sense or at least doesn’t seem to be logically right.

So the answer must be D.

Well, I don’t know how to explain in more details as the answer is quite obvious...

Posted from my mobile device

Archit3110 · Answer

IMO D ; 
A & C are not ll ; because to is missing
amongst B,D,E
reduces the spread of disease and provides is incorrect usage in B and in D is correct

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides

BelalHossain046 · Answer

Noun clause (what is much more interesting to know) takes singular VERB. IS (NOT ARE). A&C are OUT.
A & C are also providing ambiguous (two) meaning.
(1) people are genetically more similar to their friends than to strangers.
(2) people are genetically more similar to their friends than are strangers

According to meaning, "HOW THE DIFFERENCE REDUCES the spread of disease" makes sense. 
Action:
this difference reduces the spread of disease. 
How SEGMENT: COMMA+ providing them an evolutionary advantage for befriending those with different immunities

Other options are non sense (providing either separate action or purpose of main action). 
So, other options (B, C & E) are OUT.

D is unambiguous & perfect parallel with meaning sense.

saukrit · Answer

First split 
Are/IS in:  what is much more interesting to know  are/is  that the . Clearly singlular subject , Hnece, needs a singular verb. A and C are out

Let us see the remaining option

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends,  and that this  difference reduces the spread of disease , providing  Correct answer. Corrects all errors in all the other answer choices

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends,  and this difference  reducing the spread of disease provides Clear Parallelism error. E is out

IMO Answer must be D

Skywalker18 · Answer

According to scientists, people are genetically more similar to their friends than  strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing  them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing- incorrect, we need 'than to' in order to avoid ambiguity at the beginning of option; subject-verb agreement issue - 'what is much more interesting to know' is a clause and thus needs singular verb 'is'
people are genetically more similar to their friends than strangers of the same population can have two interpretations-
i.people are genetically more similar to their friends than to strangers of the same population
ii.people are genetically more similar to their friends than strangers of the same population are

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide- incorrect, we need 'than to' in order to avoid ambiguity; subject-verb agreement issue - 'what is much more interesting to know' is a clause and thus needs singular verb 'is'

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing- Correct

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides- incorrect, we need to repeat 'that' after and to show that the part that follows' this difference ...' is parallel to part that follows the previous 'that'; 
Also, the meaning of this part ' this difference reducing the spread of disease provides' is illogical

Answer D

Rakesh2019 · Answer

The correct choice will be D.

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population, but what is much more interesting to know  are  that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing
------> More ....than... should be followed by parallel elements.
 are - should be is

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide
--> same as A (parallel error)

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing
--> CORRECT

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides
--> The last fragment ",and this difference...." has no verb

kitipriyanka · Answer

Lets simplify the sentence

According to scientists, people are genetically more similar to {their friends} =X  than {strangers of the same population} =Y , but what is much more interesting to know are {that the genes controlling immunity to certain diseases are different between friends} =P , and {this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities} =Q .

So, our sentence is 
According to scientists, people are genetically more similar to X than Y, but what is much more interesting to know are P and Q

Since we can skip 'to' in case of Y, so the options we're left with are A and C. providing modifies 'the spread of disease' which is illogical. Hence C

swatihod123 · Answer

Answer choice D- to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing

The original sentence had the following errors, which were corrected in choice D.
1. parallelism error- similar to friends than  To  strangers.
2. SVA error- what is much more interesting to know  IS .
3. parallelism error- to know is that XXX and  That  this difference XXX.
4. ,providing correctly modifies the preceding clause.

umarovaalbina · Answer

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

A.   strangers   of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C.   strangers   of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing -  correct

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and   this difference reducing   the spread of disease provides

prashant212 · Answer

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing  them an evolutionary advantage for befriending those with different immunities.

A. strangers of the same population,  but what is much more interesting to know are  that the genes controlling immunity to certain diseases are  different between friends , and this difference reduces the spread of disease, providing

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and  that this difference reduces the spread of disease and provides
 
C. strangers of the same population,  but what is much more interesting to know are  that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing ---  Correct construction

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this  difference reducing the spread of disease  provides

XyLan · Answer

Sentence Structure  
 Subject  -  Verb :
  According to scientists,  
 people   are  genetically more similar to their friends than to strangers of the same population, but 
 what is much more interesting to know   is    -  what is much more interesting to know  is an ENTIRE clause acting as a subject  
 that  the genes  
   that(  genes )   control  immunity to certain diseases  
 are  different between friends, and 
 that  this difference   reduces  the spread of disease, 
 providing them an evolutionary advantage for befriending those with different immunities.   Verb-ing form( Providing ) highlighting the result of the preceeding clause.    
  
  Issues:  
 X is more Y than Z
This statement does  NOT  clearly mention the two entities being compared.
 Whether 
 X is more Y than Z is   - Comparison between X and Z   
OR 
 X is more of Y than of Z   - Comparison between Y and Z   
 Thus,  A and C    - Comparison issue

Answer choice analysis:  
  A . strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing
   - Comparison issue    OUT

B . to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides
   - Meaning issue  : The verb-ing form(  depicting the result ) is missing.
B states simultaneous actions - reduces and provides.  OUT

C . strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide
   - Comparison issue    OUT

D . to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different  between  friends, and that this difference reduces the spread of disease, providing 
  All issues check.  D  is the winner!  
However, I feel D should be - 
 genes  that control immunity to certain diseases  are different  among  friends
 rather than 
genes  that control immunity to certain diseases  are different  between  friends 
The difference in genes is among the set of friends(  plural entity ), a set which is more than 2. Thus,  among  >  between .

E . to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides
   - Meaning issue  : The verb-ing form(  depicting the result ) is missing.
  Parallelism issue( missing  that  before  this difference ... )    OUT

Ilishar · Answer

Meaning Analysis:  
Scientists believe that:
- People are genetically more similar to their friends than strangers
- More int. fact - genes which control the immunity are different between friends -> This difference minimises the spread of disease, as a result it provides an advantage for making friends of different immunity.
 Error Analysis: 
A: SV Agreement Error, Parallelism and Idiom error ( more similar to X than to Y )
B: Cause effect relationship is lost because of "and provides"
C:Parallelism and Idiom error ( more similar to X than to Y )
D: Conveys the intended meaning
E:Cause effect relationship is lost because of "Disease reducing.... provides"

baru · Answer

According to scientists, people are genetically more similar to their friends than strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

Error Analysis : 
Always comparison should be done between 2 entities properly else it would give us ambitious meaning .
Here comparison is done between people to friends and strangers . 
we can infer 2 meaning 
 1 . People are more similar to their friends than strangers are similar to their friends
 2 . People are more similar to their friends than people are similar to their friends.

sentence 2 makes more sense than 1 . So here we need a extra 'to' to infer correct meaning .

A.  strangers  of the same population, but what is much more interesting to know  are  that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease,  providing -Incorrect
As discussed above we need a 'to stranger ' to infer proper meaning .
providing - reduce in the spread of diseases is not by providing an evolutionary advantage for befriending those with different immunities. - does not make sense
ie., providing does not act as a modifier we need a 'and' to make it parallel and meaningful.

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'. 
reduces and provides are parallel.
 
C.  strangers  of the same population, but what is much more interesting to know  are  that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease  to provide -Incorrect 
Meaning changes when we use 'to provide ' as to is used to convey intention .

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease,  providing 
It contains the second errors mentioned in the option A , should be changed with the use of and .
E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference  reducing the spread of disease provides 
reducing and provides is not parallel.

bae · Answer

Correction after OA

Attack point should be:

1. comparison
a,people are much more similar to their friends than to strangers
b,people are much more similar to their friends than their friends to strangers

if i were to represent this in quantitative, this will pose a huge difference in the meaning

a,
A is three times closer to C than to B
------------C - - - A - - - - - - - - - B--------------------------------

b, A is three times closer to C than C is three times closer to B
------------C - - - A --------------------------------
------------C - - - B--------------------------------

2. parallelism: the difference is that and that this difference
3. Subject-verb singular: the interesting point "is"
4. verb modifier "providing" modifies the preceding verb "reduces", with both action referring to the right subject; "this difference" as the doer.

----------------------------------------------------------------------------------
Explanation before OA

A. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and this difference reduces the spread of disease, providing

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease and provides-Correct .
All the errors mentioned above, in option A are corrected here , use of 'to' and ' and'.
reduces and provides are parallel.

C. strangers of the same population, but what is much more interesting to know are that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease to provide

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and this difference reducing the spread of disease provides

Eliminate A,C
subject verb error 
"what is much more interesting to know" (singular) + are(plural)

Eliminate E
1/parallelism ... that... and (that) this ...
2/meaning error
3/missing verb even if the meaning is as intended

1/what is much more interesting to know is 
>that the genes that control immunity to certain diseases are different between friends, 
and 
what is much more interesting to know is 
> (that )this difference reducing the spread of disease provides

2/in terms of meaning, 
we asked ourselves, what is so interesting?
1. the fact that the genes are different and 
2. the fact that the difference reduces the spread of disease

3/"missing main verb " or "wrong use of-reducing-continuous tense" even if the meaning is as intended 
this difference "reducing" the spread of disease provides

Eliminate B
meaning error 
no causal effect relationship

The intended meaning is NOT as follows,
the fact that the difference reduces the spread is to provide an advantage

D winner
1/"difference" is the subject and doer of action -reduces and -providing

2/verb-ing verb modifier - providing modifies the action -reduces of the preceding clause
this shows the effect of the causal and effect relationship

it is because the difference reduces the spread of disease, therefore the difference provides an advantage.

...that this difference reduces the spread of disease, providing them an evolutionary advantage for befriending those with different immunities.

Posted from my mobile device

LevanKhukhunashvili · Answer

A. strangers of the same population, but what is much more interesting to know  are  that the genes controlling immunity to certain diseases are different between friends,  and this  difference reduces the spread of disease, providing
1) Parallelism: people are genetically more similar to their friends than  to  someone else. that ... and  that  - the last that is missing
2) Plural is incorrect

B. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease  and provides 
Option B says that: "this difference" reduces and provides something. Incorrect

C. strangers of the same population, but what is much more interesting to know  are  that the genes controlling immunity to certain diseases are different between friends, and that this difference reduces the spread of disease  to provide \
1) Parallelism: people are genetically more similar to their friends than  to  someone else. 
2) "are" is incorrect
3) This difference does something in order to provide. incorrect

D. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends, and that this difference reduces the spread of disease, providing 
I like it, that ..... and that .... nice parallel 
providing correctly modifies the action of "this difference reduces the spread of disease"

E. to strangers of the same population, but what is much more interesting to know is that the genes that control immunity to certain diseases are different between friends,  and this  difference reducing the spread of disease provides
1) that ... and  that  - the last that is missing
2) The difference provides something. Incorrect

According to scientists, people are genetically more similar to their

Prep Toolkit

Top 5 GMAT Debrief Videos

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards

GMAT Sentence Correction (SC - EA only) Questions

According to scientists, people are genetically more similar to their

Prep Toolkit

615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

745 with Only Self-Prep and GMAT Club

From 555 to 765: 210-point Improvement

Perfect 805 Score Debrief by Julia

My Rewards