Which of the Following Best Explains the Social Brain Hypothesis

Which of the following best explains the social brain hypothesis?

A) Primates have large prefrontal cortices because they live in dynamic social groups that change over time.
B) Primates have large amygdalae because they need to be able to detect emotions in their group members.
C) Primates have large facial recognition regions because they need to be able to easily identify ingroup and outgroup members.
D) Primates have large pain recognition areas because they empathize with pain experienced by ingroup members.