vikram_k51 wrote:722. The data collected by weather airplanes that fly into the heart of a hurricane are useful mainly for gauging the storm's structure and strength, not for the speed and the path of their movement.

(A) not for the speed and the path of their movement
(B) not for the speed and path of its movement
(C) not the speed and path of its movement
(D) and not the speed and path of their movements
(E) and not for the speed and the path of its movements


OA C

Let's go for POE to help resolving it quickly.
"their" should be wrong because of subject verb agreement. "Storm's" should have "its", not "their". So A and D are out.
Now comes parallelism. We can not use "not for" as per parallelism structure here.
"useful mainly for gauging the storm's structure and strength" We do not need to use "for" because parallelism is between "storm's structure and strength" and second phrase. Parallelism is not between "for guaging..." and second phrase.
So out of B, C and E, B and E are out.
Left with C which is the correct answer
Please let me know if I am missing anything here or this helped in getting better understanding of the problem.

riteshbindal wrote:

vikram_k51 wrote:722. The data collected by weather airplanes that fly into the heart of a hurricane are useful mainly for gauging the storm's structure and strength, not for the speed and the path of their movement.

(A) not for the speed and the path of their movement
(B) not for the speed and path of its movement
(C) not the speed and path of its movement
(D) and not the speed and path of their movements
(E) and not for the speed and the path of its movements


OA C

Let's go for POE to help resolving it quickly.
"their" should be wrong because of subject verb agreement. "Storm's" should have "its", not "their". So A and D are out.
Now comes parallelism. We can not use "not for" as per parallelism structure here.
"useful mainly for gauging the storm's structure and strength" We do not need to use "for" because parallelism is between "storm's structure and strength" and second phrase. Parallelism is not between "for guaging..." and second phrase.
So out of B, C and E, B and E are out.
Left with C which is the correct answer
Please let me know if I am missing anything here or this helped in getting better understanding of the problem.

Ritesh, agree with your explanation, but dont we need a conjuction to join the 2 clauses after the comma ?

I think it's not necessary here. And also, the options which have conjunction are gramatically incorrect. So the best answer in choices can be just C. GMAT doesn't give the best grammatical answers but we have to just choose whichever is best among the options

HI pandey,

your question is

Ritesh, agree with your explanation, but dont we need a conjuction to join the 2 clauses after the comma ?
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722. The data collected by weather airplanes that fly into the heart of a hurricane are useful mainly for gauging the storm’s structure and strength, not for the speed and the path of their movement.

(A) not for the speed and the path of their movement
(B) not for the speed and path of its movement
(C) not the speed and path of its movement
(D) and not the speed and path of their movements
(E) and not for the speed and the path of its movements


OA C

actually, we are not compairing two diffrent clauses but are requited to just parallel the inbuilt noun phrases of a clause.

so in option c no conjunction is required.

EXPERTS PLEASE correct me if I am wrong.