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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. The reason for the train being late

B. was because

C. the train was involved

D. in an accident.

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