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.