Sentence Correction

The number of mountain gorillas is declining with such rapidity that the population is one-half in the twenty years between a count made by George Schaller in 1960 and the one made by Dian Fossey in 1980.
(A) with such rapidity that the population is one-half
(B) with such rapidity that the population was one-half
(C) so rapidly the population divided in half
(D) so rapidly that the population was halved
(E) in such rapidity that the population is halved

why not [spoiler]C?[/spoiler]

real2008 wrote:The number of mountain gorillas is declining with such rapidity that the population is one-half in the twenty years between a count made by George Schaller in 1960 and the one made by Dian Fossey in 1980.
(A) with such rapidity that the population is one-half
(B) with such rapidity that the population was one-half
(C) so rapidly the population divided in half
(D) so rapidly that the population was halved
(E) in such rapidity that the population is halved

why not [spoiler]C?[/spoiler]

cause the proper idion is so X{adjective} that Y, hence D

why B is wrong ?

goelmohit2002 wrote:why B is wrong ?

With such rapidity is too wordy. So rapidly is a much better form we can use here..

dumb.doofus wrote:

goelmohit2002 wrote:why B is wrong ?

With such rapidity is too wordy. So rapidly is a much better form we can use here..

Thanks.

Is there a scientific way to find out whether a phrase/word is wordy or not ? I have seen many OG questions where they prefer the longest answer.....

Please help me understand how to master the art of eliminating a choice based on wordiness

oa is D