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.

Correct Answer : C.

I feel bad for at ……Some adverbs have two forms, the form ending in - ly and the form which is the same as the adjective. For e.g. He sings very loud. He sings very loudly. The word bad is appropriate in the sentence given.