It is the "most correct" answer (logically)...these types of questions often have a "correct" answer, and a 'more corrrct' answer. The more correct answer is the only acceptable answer to the question. That is why these questions are difficult.
And, btw, very little formal mathematical education, is required to solve them ..
RE: Believing in God saves you? From what?
Allow me to have the honor of making the first comment, here, Mr CROWNAFFAIR