Refer to the Figure

Refer to the figure.
Which statement regarding comparisons among brains can be concluded from the figure?

A) Ancestral vertebrates did not have cerebral hemispheres.
B) The evolution of larger brains in sharks is linked to the development of larger brains in mammals.
C) Both birds and teleost fishes have relatively small olfactory bulbs because they evolved from a common ancestor.
D) The relatively large cerebellum of birds and mammals evolved independently.