Sentence Correction: In The Gulf of Mexico's Dead zone....

[abhilaash.70s]

Hi,

Came across this question in a 800score.com test but could not fathom the explanation given at the end... Would somebody be kind enough to explain what is the right answer and if 800score's explanation is valid.

[deleted by Stacey; please see below.]

[StaceyKoprince]

Please read (and follow!) the forum guidelines before posting.

We only solve MGMAT or GMATPrep problems on this forum. If you want to discuss problems from other sources, please ask your teacher before or after class, ask during office hours, or use another resource such as Beat The GMAT.

[abhilaash.70s]

Sorry. :-(

[StaceyKoprince]

Not a problem - just make sure to read and follow the guidelines in future. :)