Read the sentence below to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Choose the option with that part as your answer. If there is no error, choose 'D' as your answer. (Ignore the errors of punctuation, if any).

One of the members expressed doubt if the Minister was an atheist.

A.

One of the members

B.

expressed doubt if

C.

the Minister was an atheist.

D.

No error.

Correct answer is B

expressed doubt that