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In each of these 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. Sunita is more talkative than

B. anybody in the class because

C. he is not afraid of the teacher

D. who is his own brother

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