Hi vinviper1,

Here's a helpful hint: the word "being" is incorrect 99.999999% of the time. Once in awhile someone comes across an oddball question where "being" is in the correct answer, but it's very, very rare. There's one in the official guide where it is talking about "human beings", and I saw someone post a different question in which "being" was correct on this forum, but those are the only two I've come across in my three years of GMAT teaching experience.

I know, it's not a grammatical rule, but it works for GMAT purposes!

Another way to approach this problem:

Parallelism demand that the ans ends in "both from"

This eliminates B and C

Among A,D and E

D is outright wrong because we should be able to remove the 'which construct without changing the meaning of the sentence

E changes the meaning of the sentence and also if you remove the which construct sentence does not make sense

Verb agreement can be maintained if Comes verb is applied.
Methane.............comes....
Option A is correct.




Regards,
Saurabh

Thanks all! And Jim I appreciate the veteran advice.