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(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.
--> Incorrect. Subject verb agreement error - for statement format "..exploration and subsequent mapping.. requires.." - 'require' should be used instead of 'requires'

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.
--> Correct. - Though this sentence changes the meaning of the original sentence slightly by indicating the equal magnitude of proof is provided by 'near-death experience' and 'massive costs of rescue operation', this sentence does not have any grammatical error.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.
--> Incorrect. Subject verb agreement error - 'exploration and subsequent mapping.. requires..'

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.
--> Incorrect. Subject verb agreement error - 'exploration and subsequent mapping.. require..' should be used instead of 'exploration and subsequent mapping.. requires..'

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.
--> Incorrect. - sentence format '..proven both by X as much as by Y..' is incorrect, instead it should be 'proven both by X & by Y'.
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That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.





 


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A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires... Here, the exploration and subsequent mapping are two things and should have a plural verb tense require, not requires.

B) Seems fine.

C) Same reason as A.

D) Same reason as A.

E) The process of exploring and mapping the underwater cave system’s interior require... Here, The process of something and something is a singular noun so it should have singular verb tense requires instead of require.

Answer B
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Answer: B

That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers. --> Incorrect. Plural subject 'Exploration and subsequent mapping' needs plural verb 'require'.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers. --> Correct. SV agreement is fine for 'exploration and subsequent' and 'require'. SV again fine for 'That' and 'has been proven'. parallelism maintained with ...just as much by...as by...

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution. --> Incorrect. just as much by...as well as by.. is not parallel. Plural subject 'Exploration and subsequent mapping' needs plural verb 'require'.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them. --> Incorrect. Plural subject 'Exploration and subsequent mapping' needs plural verb 'require'.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them. --> Incorrect. Singular subject 'Process' needs singular verb 'requires'.
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B

Subject very agreement and statement makes clear sense
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That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers. Correct

seems good

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers. Incorrect

SV issue - 'the exploration and subsequent mapping' is singular, so requires should be requires

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution. Incorrect

idioms issue - .......as much by ..........as by...........; 'as well as by' uses wrong

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them. Incorrect

second part of the sentence is not good

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them. Incorrect

SV issue - same as B
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That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

Use of 'requires' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is correct; But, the use of 'that' in the beginning is inappropriate since no clear antecedent is attributed

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

Use of 'require' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is incorrect; Also, the use of 'that' in the beginning is inappropriate since no clear antecedent is attributed


(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

Inappropriate modifier usage -- 'the exploration and mapping' has not been proven, rather it is the requirement of experience and caution -- which has been proven by near death experience and rescue operations

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

CORRECT meaning evident in that , it clearly depicts that requirement of extensive experience and caution has been proven by near death experiences and rescue operations. Also, correct parallel structure for usage of 'not only..but also'


(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.

Use of 'require' to depict singular verb for the phenomenon of 'the exploration and mapping of underwater cave system's Byzantine interior' is correct. Simultaneously, use of 'both' and 'as much as' is redundant

Meaning is the key..

(D) is the CORRECT answer


Hope this helps..
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Bunuel
That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.

 


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Options C and E use the incorrect idiom forms (C: just as much by... as well as by... is WRONG, should be: just as much by... as by... ) (E: both by... as much as by... is WRONG, should be: both by... and by...). Eliminate C and E.

Options A,B and D can be differentiated on different aspects but one that strikes out is the sentence formation, structure and conciseness. Both A and B have the sentence stated in a long manner, starting with that and using amateur cave divers twice for no reason.
Option D corrects all errors. Sentence starts with The, is short and concise, uses the correct idiom for this particular sentence to highlight two different aspects (not only... but also...), and also uses them to avoid reference of amateur divers for a second time. Eliminate A and B.

Answer - D
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That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

[the passive construct in phrase <<caution has been proven both by ... cave divers.>> is awkward and wordy]

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

[seems legit]

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

[the phrase<<Proven just as much by>> should modify caution and NOT the exploration]

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

[The exploration and subsequent mappingr are plural and must be followed by verb <<require>>]

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.

[The process of exploring and mapping the underwater cave system’s interior is singular and must be followed by verb <<requires>>]

IMO Option B
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(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

Subject – verb disagreement: exploration and mapping requires (should be “require”)

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

Correct choice. So far no problem.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

“just as much” and “as well as” are unidiomatic. Should be “just as much A as B”

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

Subject – verb disagreement: exploration and mapping requires (should be “require”)

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.

“both” and “as much as” are unidiomatic. Should be “both A and B”.

So B
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That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.

The correct answer is B.
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Bunuel
That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.





 


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ANSWER B

(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers. Incorrect S-V agreement

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers. CORRECT

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution. Incorrect S-V agreement

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them. Incorrect S-V agreement

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them. Incorrect S-V agreement
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The answer is B. OE is already posted. Edited for correct answer.
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Hi jackd012,

I gave you Kudos for this one as this is your first post/explanation. However, you should aim to have more to be able to actually count it as a valid explanation :cool:
Next time ;-)

jackd012
B

Subject very agreement and statement makes clear sense
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Bunuel
That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.


(A) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior requires extensive experience and caution has been proven both by the near-death experiences of amateur cave divers and by the massive costs of the rescue operations to save those amateur cave divers.

(B) That the exploration and subsequent mapping of the underwater cave system’s Byzantine interior require extensive experience and caution has been proven just as much by the near-death experiences of amateur cave divers as by the massive costs of the rescue operations to save those amateur cave divers.

(C) Proven just as much by the near-death experiences of amateur cave divers as well as by the massive costs of the rescue operations to save those amateur cave divers, the exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution.

(D) The exploration and subsequent mapping of the underwater cave system’s interior requires extensive experience and caution, as has been proven not only by the near-death experiences of amateur cave divers but also by the massive costs of the rescue operations to save them.

(E) The process of exploring and mapping the underwater cave system’s interior require extensive experience and caution, proven both by the near-death experiences of amateur cave divers as much as by the massive costs of the rescue operations to save them.





 


This question is by Manhattan Prep for the GMAT Club World Cup Competition

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Official Explanation is pinned as BEST Reply HERE.
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Automated notice from GMAT Club VerbalBot:

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