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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. If I knew all the facts,

B. I would not have stood bail for him

C. and defended him to my friends who

D. had warned me to keep away from him

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