Reported to Direct speech conversion

This is one of the questions in an exam. According to the official answer key, correct answer is (B). But I found that the most correct answer could be (A). Can any one please point out the right answer with justification?

DIRECTIONS: The following sentences are given in Direct speech.
Change these sentences into correct reported speech:

Q. He said to him, “ Is not your name Ram”.

(A) He asked him if his
name was Ram.

(B) He inquired whether his name was not Ram.

(C) He said to him if his name was not Ram.

(D) He narrated him if name was

not Ram