I think the answer would be A. Her fear of being thought anti-revolutionary. At this time, being anti-revolutionary could get someone moved out of the country, and since Niu Fen was a loud-mouth, she could be able to tell someone about it. Especially since it reads, "<span>I don't know whether Niu Fen reported Wenli to the school leaders." </span>
I would believe this is a complex sentence. It contains a dependent and an independent clause to create one full sentence and a conjunctionn cannot combine the two clauses because of the questioning word in the very beginning of the sentence.
