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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. After the option to study French was abolished,

B. the college attracted less students

C. and the strength of our class

D. is just thirty now

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