GMAT Sentence Correction (SC) | Re: Although he is as brilliant as, if not more brilliant than, many of h

(A) Although he is as brilliant as, if not more brilliant than, many of his fellow students, he is very lazy and his thesis will be unfinished. - Incorrect. Not concise.

(B) Although he is as brilliant as, if not more brilliant than, many of his fellow students, he is very lazy with his thesis remaining unfinished. - Incorrect. Run on sentence.

(C) Although he is as brilliant as, if not more brilliant than, many of his fellow students, he is very lazy and will not finish his thesis. - Correct.

(D)
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