Why Is It Thought That Advances Such as Agriculture,literacy,and Urbanization

Multiple Choice

Why is it thought that advances such as agriculture,literacy,and urbanization have not been accompanied by additional increases in brain size?

A) The earliest Homo sapiens were as intelligent as contemporary humans.
B) Although brain size has remained constant,brain density has increased.
C) The physiological cost of a bigger brain exceeds its benefit.
D) More efficient neuronal connections account for modern human advancements.