2. What theory is the best support for why primates evolved such large brains?

a. They tend to eat protein-rich foods that could support expansive neural development.

b. They tend to eat fruit, and have to remember the location of fruit trees that would be ripe at each time period in the season.

c. Part of their diet consists of nuts and termites, and obtaining them requires ingenuity

d. They tend to live in large social groups, which requires intelligence to function effectively.

e. There is an unequal number of males and females, so individuals must outsmart their competitors to attract mates.