Which words in the sentence are the adverb clause?

They asked me for my opinion as if they really wanted it.

A.

They asked me for my opinion

B.

for my opinion

C.

as if they really wanted it

The correct answer is C, because an adverb clause is a dependent clause, it has to be a part of a larger, main sentence. Therefore, A cannot be the correct answer, because that is an independent sentence. B is not a clause because there is no verb.