The Higher Similarity of the Chimpanzee Genome to Humans Compared

The higher similarity of the chimpanzee genome to humans compared to baboons or dogs is accounted for by what main concept.

A) Some species share identical genomes where others are highly variable.
B) Over time divergence has occurred forming genetic differences, some bigger than others.
C) Species have become less diverse over time creating more mutations between species.
D) Reduction in divergence means a closer relationship between some species.