Because there are two choices,answer 1 and answer 2, there are only 4 possible ways to answer; only answer 1, only answer 2, neither 1 or 2, both 1 and 2. Maybe it got confusing because you were reading into it too much.

Suppose the question was: Who has hit 70 or more homeruns in a season?

1. Mark Mcquire
2. Barry Bonds

Answer-

A.Answer 1
B.Answer 2
C.Both 1and 2
D. Neither 1 or 2

A woman who had no idea about the game would have an even percentage no matter what she guessed.