"Social brain theory" states that ____.
a. the human brain evolved to enable humans to have rich, complex social lives
b. the human brain evolved to allow humans to develop language
c. humans are born with access to a "collective unconscious" (certain types of cumulative social knowledge)
d. unlike to the left and right hemispheres in the brains of other animals, the two hemispheres in the human brain are much more "social" (communicative) with one another
Answer: A