The acquisition of culture by humans stems most directly from:

A) an evolved ability for high mental flexibility.
B) our larger brain.
C) improved diet.
D) the invention of smartphones.

Mental Flexibility

The cognitive ability to adjust one's thinking or strategy in response to new information, demands, or changed conditions.

Acquistion Of Culture

The process through which individuals learn the values, norms, customs, knowledge, and skills that guide their behavior in their society.