What Is a Critique of the Social Brain Hypothesis

What is a critique of the social brain hypothesis?

A) Comparisons of neocortex ratios across primate species go against the social brain hypothesis.
B) Comparisons of the encephalization quotient across primate species go against the social brain hypothesis.
C) Research on the diets of humans compared to other species of primates is more strongly supported than to the social brain hypothesis.
D) Evidence supporting the social brain hypothesis is limited to humans and does not extend to other species of primates.
E) The social brain hypothesis predicts that group living is beneficial to primates but it doesn't explain why.