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. Preetam asked her sister

B. why had she not gone to the school

C. the previous day

D. or applied for leave

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