Definition: You are given a question on human sexuality. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: The theory of _______ is used by sociobiologists specifically to explain the evolution of gender differences.
(A)natural selection (B)the new synthesis (C)sexual selection (D)the gender schema

C