Which of the following is NOT direct evidence for the social brain hypothesis?
A) Humans outperform other primates in social problem-solving tasks.
B) More social species of whales and birds have larger brains.
C) Humans have a large encephalization quotient.
D) Less social animals have fewer cognitive skills.
E) As predicted by the neocortex ratio,the average human social group size in subsistence societies is around 150 members.
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