Which Statement About Mammal Brain Evolution Is False

Which statement about mammal brain evolution is false?

A) Dolphins and humans have much larger brains that would be predicted based on body sizes.
B) Elephants and blue whales have large brains, but they fall close to the regression line of brain mass versus body mass.
C) The cerebral cortex is elaborated in mammals.
D) Convolutions in the brains of mammals decrease the surface area of the cortex.
E) The percent of cortex that is association cortex is greatest in humans.