Definition: You are given a question on prehistory. 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: Genetic analysis shows that humans and chimps have been evolving separately for about how long?
(A)2 million years (B)4 million years (C)7 million years (D)15 million years

C