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In the following questions, a sentence has been divided into four parts and marked a, b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

A. He is so versatile

B. that he is capable of beating

C. all his other classmates

D. both in studies, public speaking and sports

Please do not use chat terms. Example: avoid using "grt" instead of "great".