Unlike birds, which are highly sensitive to atmospheric pressure, peop

Question

Unlike birds, which are highly sensitive to atmospheric pressure, people have found  that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity .

(A) that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity

(C) that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

(D) paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity

(E) that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity

Bunuel · Accepted Answer

OFFICIAL EXPLANATION

Unlike birds, which are highly sensitive to atmospheric pressure, people have found  that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity .

(A) that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

Incorrect.

This answer choice is grammatically incorrect. It contains two Subject Verb Agreement mistakes.

The first mistake is that the singular subject  paragliding  does not agree with the plural verb  require . The second mistake is that the singular subject  detecting  does not agree with the plural verb  are .

The following Stop Sign helps you identify this mistake:

a subject in the form of Verb + ing or To + V1

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity

This answer choice corrects both original Subject Verb Agreement mistakes, by changing the sentence structure and eliminating the relative clause  that paragliding require, etc..

In the original sentence, the first mistake was that the singular subject  paragliding did  not agree with the plural verb  require . In the corrected sentence this construction is replaced by an object phrase      the use of a variometer crucial  for  paragliding .

The second mistake was that the singular subject  detecting  did not agree with the plural verb  are . By eliminating the original subject ( detecting ) and creating a new clause in which the pronoun  it  serves as a subject replacement ("it is impossible to detect") the original Subject Verb Agreement issue is eliminated.

Remember that a subject in the form of To Verb or Verb+ing is considered a singular subject.

(C) that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

Incorrect.

This answer choice corrects one of the original Subject verb Agreement mistakes by replacing the plural verb  require  with the singular  requires .

However, it repeats the other original Subject Verb Agreement mistake: the singular subject  detecting  does not agree with the plural verb  are .

The following Stop Sign helps you identify this mistake:

a subject in the form of Verb + ing or To + V1

(D) paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity

Incorrect.

Although this answer choice corrects both original Subject Verb Agreement mistakes, it is stylistically flawed. Wordiness is created by replacing the single word  since  with the five-word phrase  due to the fact that ; replacing the single word  impossible  with the two-word phrase  not possible ; and replacing the single word  using  with the four-word phrase  with the use of .

(E) that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity

Incorrect.

Although this answer choice corrects both original Subject Verb Agreement mistakes, it changes the meaning of the original sentence. Changing the word  detecting  to  detected  turns the word  currents  into the subject whereas in the original sentence the subject was  detecting .

Also, the original sentence does not concern the handling of thermal currents; it concerns their detection.

SohGMAT2020 · Answer

Unlike birds, which are highly sensitive to atmospheric pressure, people have found  that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity .

The sentence means to say that people need to use some special equipment for paragliding unlike birds. But in option A, C , and D it says Paragliding requires variometer. So eliminate A, C, and D

(A) that  paragliding require  the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity - This one also has subject - verb agreement issue

(C) that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

(E) that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity

Between B and D, B is a more concise and direct way to convey the intended meaning: Hence Eliminate D and choose B as the correct answer.

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity

(D) paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity

100mitra · Answer

Correct Option B

Original sentence: 
Unlike birds,
- which are highly sensitive to atmospheric pressure,
- people have found that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity.

Sentence meaning :
In contrast similarity of flying, comparison with birds, which are highly sensitive to atmosphere pressure,and can detect thermal currents during their fly, people on other side are unable to measure thermal currents, who are doing paragliding, by normal human motion sensor, to measuring this thermal currents varimotors device is used.

Based on only meaning, A, C, D and E are eliminated,
because the phrase in sentence refer with usage of "That" as that paragliding require the use of a variometer, which is wrong,
here "paragliding" works as a Noun/Subject,
we need paragliding as a  verb  and instrument varimotors device as  Noun  to have intended meaning of the sentence.

Remaining with B and only correct. 
(Pronoun It refer to "pressure")

mendax · Answer

Unlike birds, which are highly sensitive to atmospheric pressure, people have found that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity.

(A) that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity

(C) that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity

(D) paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity

(E) that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity

In my opinion the answer should be C.
As per subject verb agreement the verb should take singular form, thus there should be requires after paragliding. This eliminates option A,B and D, left with the option C and E. E changes the meaning of the sentence, thus C should be the answer.

Posted from my mobile device

Green2k1 · Answer

Sentence Structure
Unlike birds, 
--------which are highly sensitive to atmospheric pressure, 
people have found 
-------- that paragliding 
-----------------require the use of a variometer 
-----------since detecting thermal currents 
----------------are impossible using normal human motion sensitivity.

Error Analysis:
1. Paragliding is singular - (require -> requires) Subject Verb Agreement(SVA) error 
2. Detecting is singular - ( are ->is) - SVA error

POE

(A) that paragliding  require  the use of a variometer since detecting thermal currents  are  impossible using normal human motion sensitivity
- Error as highlighted above

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity
 - Sentence structure has been changed
- Not able to find any concrete error in this option - so lets look for errors in other option
- here "it" is acting as placeholder pronoun

(C) that paragliding requires the use of a variometer since detecting thermal currents  are  impossible using normal human motion sensitivity
- paragliding requires - corrects SVA error
- detecting thermal currents are - 2nd SVA error is still there

(D) paragliding  to require  the use of a variometer  due to  the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity
- to require - is showing the intent - which is not the intended meaning
- use of due to provide the reason for "paragliding to require the use of a variomete" is incorrect

(E) that paragliding requires the use of a variometer since detected thermal currents  are  impossible to handle using normal human motion sensitivity
- detected thermal currents are - SVA Error

B is not ideal but other options contain blatant error
Correct B

sivatx2 · Answer

Unlike birds, which are highly sensitive to atmospheric pressure, people have found  that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity.

(A) that paragliding  require  the use of a variometer since detecting thermal currents  are  impossible using normal human motion sensitivity 
  Subject verb agreement errors at 'require' and 'are'. Eliminate

(B)  the use of a variometer crucial  for paragliding since  it is impossible  to detect thermal currents using normal human motion sensitivity 
"the use of a variometer crucial" as a modifier gives additional information on what people have found, and the usage is perfectly fine here. 
'It' can be used as a subject when there is no identifiable actor. For example, "It is a fact that sun rises in the east", "It is still unknown who stole the umbrella".
 (C) that paragliding requires the use of a variometer since detecting thermal currents  are  impossible using normal human motion sensitivity 
  Subject verb agreement errors at 'are impossible', as the subject 'detecting thermal currents' is singular. Eliminate

(D) paragliding  to require  the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity 
  Usage of verb, 'to require' is awkward here as there is already the main clause (people have found) followed by another subordinate clause 'paragliding to require the use of a variometer'. It would be cleaner if the compound conjunction, 'that' was used between the 2 clauses. Eliminate

(E) that paragliding requires the use of a variometer since  detected thermal currents are  impossible to handle using normal human motion sensitivity 
  Subject verb agreement errors at 'are impossible', as the subject 'detected thermal currents' is singular. Eliminate

TarunKumar1234 · Answer

Unlike birds, which are highly sensitive to atmospheric pressure, people have found that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity.

(A) that paragliding require the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity
[color=#ff0000]Subject verb agreement errors at 'require' and 'are'. Eliminate
[/color]

(B) the use of a variometer crucial for paragliding since it is impossible to detect thermal currents using normal human motion sensitivity
"the use of a variometer crucial" as a modifier gives additional information on what people have found, and the usage is perfectly fine here.
'It' can be used as a subject when there is no identifiable actor. For example, "It is a fact that sun rises in the east", "It is still unknown who stole the umbrella".
(C) that paragliding requires the use of a variometer since detecting thermal currents are impossible using normal human motion sensitivity
Subject verb agreement errors at 'are impossible', as the subject 'detecting thermal currents' is singular. Eliminate

(D) paragliding to require the use of a variometer due to the fact that detecting thermal currents is not possible with the use of normal human motion sensitivity
Usage of verb, 'to require' is awkward here as there is already the main clause (people have found) followed by another subordinate clause 'paragliding to require the use of a variometer'. It would be cleaner if the compound conjunction, 'that' was used between the 2 clauses. Eliminate

(E) that paragliding requires the use of a variometer since detected thermal currents are impossible to handle using normal human motion sensitivity
Subject verb agreement errors at 'are impossible', as the subject 'detected thermal currents' is singular. Eliminate

Unlike birds, which are highly sensitive to atmospheric pressure, peop

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GMAT Sentence Correction (SC - EA only) Questions

Unlike birds, which are highly sensitive to atmospheric pressure, peop

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