The Structure of Human Cytochrome C Is the Same as That

The structure of human cytochrome c is the same as that of chimpanzees, but it differs from the structure of cytochrome c in chickens by 16 amino acids and in yeast by more than 50 amino acids. From these data, one could hypothesize that humans are most closely related evolutionarily to

A) chimpanzees.
B) yeast.
C) dogs.
D) chickens.
E) chimpanzees, chickens, and yeast equally because they all have cytochrome c.