I think that the responses already given adequately address all the wrong answers, so I'll just clarify a few points about comparison.
(1) If you use "less," "fewer," or "more" to make a comparison, and if both nouns/prepositional phrases/whatever being compared appear after the "less" or "more," then you must use "than" to introduce the second. (This eliminates A, B, and D)
He has fewer cats than dogs.This is
correct, because "more" precedes the first noun, "cats," and "than" preceded the second noun, "dogs."
This is the structure you can expect to see on the GMAT.
He has three dogs, but fewer cats.This is
correct. It uses "fewer" without "than," but one of the nouns being compared appears before the "fewer."
Offhand, I don't remember seeing this structure on the GMAT.
(2) All of the words "less," "fewer," and "more" imply comparison, so any additional comparison signal, such as "compared to" or "relative to" is redundant. (This eliminates A, B, and D)
(3) Whatever the elements being compared, they must be both logically comparable and structurally similar. No comparison signal/parallel marker can coordinate two elements unless those elements are the same part of speech. (This eliminates A, B, and D)
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