Which of the Following Explains How Chimpanzees and Humans Can

Which of the following explains how chimpanzees and humans can be so different with such similar genomes?

A) The anatomical and behavioral differences between chimpanzees and humans aren't that large.
B) Different environments between the two populations influenced the anatomical and behavioral differences.
C) The human population is so much larger than the chimpanzee population that we benefit from more genetic variation.
D) The genetic differences could have occurred in genes responsible for development.
E) None of the other answer options is correct.