THE ORIGINAL SENTENCE USES THE VERB SINGULAR VERB "IS" WIT...

29. The original sentence uses the verb singular verb "is" with the

plural noun "western states". Moreover, the phrase "the more

people that move to western states" is not parallel with "the more

pressure on water resources becomes increasingly great." These two

parts of the idiomatic construction "the more x, the more y" need to

be in the same form. We need to find a replacement.

Choice A is the same as the original sentence. Incorrect.

Choice B repeats the subject-verb mistake of the original and does

not rectify the parallelism issue. Incorrect.

Choice C makes the parallelism even worse by beginning with a

phrase "with more people moving to western states" that is not

capable of sustaining the "the more x, the more y" construction.

Incorrect.

Choice D avoids the subject-verb problem but does not remedy the

parallelism issue, since "the more that people move" is not parallel

with "the greater the pressure on water resources becomes".

Choice E remedies the subject-verb problem and deals with the

parallelism issue with the pair of phrases "the more people move to

western states" and "the greater the pressure on water resources

becomes." Correct.