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by: Bunuel
25 mins
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
62% (01:13) correct
38%
(01:18)
wrong
based on 860
sessions
History
Date
Time
Result
Not Attempted Yet
If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the incidence of skin cancer and eye disease, and perhaps even threatening global ecological systems.
(A) and perhaps even threatening
(B) and may even threaten
(C) and even a possible threat to
(D) as well as possibly threatening
(E) as well as a possible threat to
_________________
(A) and perhaps even threatening
(B) and may even threaten
(C) and even a possible threat to
(D) as well as possibly threatening
(E) as well as a possible threat to
_________________
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If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the incidence of skin cancer and eye disease, and perhaps even threatening global ecological systems.
As written "ultraviolet radiation will endanger human health, causing ... and perhaps even threatening ...", the sentence seems to present two HOW-aspects of the action "will endanger human health".
It is not correct as "causing a rise in the incidence of skin cancer and eye disease" definitely explains how UR causes bad things to human health, but "threatening global ecological systems" is not. This is an incident of forced parallelism, the second part does not explain the effect of UR of health rather completely different effect.
We need an answer choice that makes parallel another list: "will endanger" and "will threat".
As written "ultraviolet radiation will endanger human health, causing ... and perhaps even threatening ...", the sentence seems to present two HOW-aspects of the action "will endanger human health".
It is not correct as "causing a rise in the incidence of skin cancer and eye disease" definitely explains how UR causes bad things to human health, but "threatening global ecological systems" is not. This is an incident of forced parallelism, the second part does not explain the effect of UR of health rather completely different effect.
We need an answer choice that makes parallel another list: "will endanger" and "will threat".
Quote:
- incorrect for the reason explained above
Quote:
- correct
Quote:
- "and" requires us to maintain parallelism: noun ("a possible threat") is not parallel to verb ("will endanger")
Quote:
- same as A
Quote:
- same as C
Posts: 4,849
Let’s simplify the sentence:
If pollution continues, the increase will endanger X, causing …, and [threaten] Y.
We can see that X and Y have to be parallel and the verb forms as well. Based on this we can eliminate the options:
(A) and perhaps even threatening – not parallel. Eliminate.
(B) and may even threaten – parallel. Best choice.
(C) and even a possible threat to – not parallel. Eliminate.
(D) as well as possibly threatening – not parallel. Eliminate.
(E) as well as a possible threat to – not parallel. Eliminate.
Hope this helps!
If pollution continues, the increase will endanger X, causing …, and [threaten] Y.
We can see that X and Y have to be parallel and the verb forms as well. Based on this we can eliminate the options:
(A) and perhaps even threatening – not parallel. Eliminate.
(B) and may even threaten – parallel. Best choice.
(C) and even a possible threat to – not parallel. Eliminate.
(D) as well as possibly threatening – not parallel. Eliminate.
(E) as well as a possible threat to – not parallel. Eliminate.
Hope this helps!
Notice there is a comma before the underlined part!
That comma means that there are two cases:
1. we have an "and", then the underlined part cannot be parallel with "causing a rise" because "A, and B" pattern is wrong. Therefore, the underlined part must be parallel with "will endanger human health". (actually you can very easily approach this by thinking through the meaning, but I am talking in the scope of grammar)
2. we have an "as well as", then the underlined part must be parallel with "causing a rise" because it follows the format of "A , as well as B".
By the rules above, we can eliminate A, C, E because they are not parallel.
We are left with B and D. However, the meaning in D is illogical: the action of "endanger human health" cannot cause "threaten global ecological systems". Therefore, B correct.
Again, we should always approach SC questions through meaning. But here I am actually working in terms of grammar first just to show you guys the difference between "and" and "as well as".
_________________
That comma means that there are two cases:
1. we have an "and", then the underlined part cannot be parallel with "causing a rise" because "A, and B" pattern is wrong. Therefore, the underlined part must be parallel with "will endanger human health". (actually you can very easily approach this by thinking through the meaning, but I am talking in the scope of grammar)
2. we have an "as well as", then the underlined part must be parallel with "causing a rise" because it follows the format of "A , as well as B".
By the rules above, we can eliminate A, C, E because they are not parallel.
We are left with B and D. However, the meaning in D is illogical: the action of "endanger human health" cannot cause "threaten global ecological systems". Therefore, B correct.
Again, we should always approach SC questions through meaning. But here I am actually working in terms of grammar first just to show you guys the difference between "and" and "as well as".
_________________
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wadhwakaran
Joined: 31 Mar 2022
Last visit: 22 Jul 2025
Posts: 257
Location: India
Concentration: General Management, International Business
Schools: INSEAD Aug'24 intake Oxford Said'25 Judge '25 Imperial'25 HEC Sep'24 Intake LBS '26 ISB '27
GMAT 1: 700 Q50 V35
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Schools: INSEAD Aug'24 intake Oxford Said'25 Judge '25 Imperial'25 HEC Sep'24 Intake LBS '26 ISB '27
GMAT 1: 700 Q50 V35
Posts: 257
(A) and perhaps even threatening Incorrect not parallel to the verb will endanger
(B) and may even threaten Correct
(C) and even a possible threat to Incorrect not parallel to the verb will endanger
(D) as well as possibly threatening Incorrect not parallel to the verb will endanger
(E) as well as a possible threat to Incorrect not parallel to the verb will endanger
(B) and may even threaten Correct
(C) and even a possible threat to Incorrect not parallel to the verb will endanger
(D) as well as possibly threatening Incorrect not parallel to the verb will endanger
(E) as well as a possible threat to Incorrect not parallel to the verb will endanger
i do understand that there is parallelism error but why parallel with "will endanger"? he parallel statements are 1.causing a rise .....and 2.perhaps even threatning....
i thought causing and thretning are parallel? where am i going wrong..
?
also if parallel list starts with will endanger...how causing is correct? shouldnt it be "will cause"?
Can someone pls help..
i thought causing and thretning are parallel? where am i going wrong..
?
also if parallel list starts with will endanger...how causing is correct? shouldnt it be "will cause"?
Can someone pls help..
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