The Cerebral Cortex of the Human Brain Is Much More

The cerebral cortex of the human brain is much more highly and intricately folded than the same region in other animals. Why might this be the case?

A) The folds create more surface area for the production and release of the hormones that allow the human nervous system to interact with the endocrine system.
B) The folds are the remnants of the compression of the brain that occurs during childbirth.
C) The folds increase the surface area available for the complex thoughts and processing that occur in that region of the human brain.
D) Evolution has caused the brain to increase in size faster than the skull has increased in size. Folding allows our larger brain to more easily fit into our skulls.