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. Like his brother who did not wear his helmet

B. and was injured in the accident

C. Rajan was always careful

D. and wore his helmet without fail

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