Answer: The correct answer is peer pressure.
Explanation: Peer pressure occurs when someone's behavior is influeced by their peers. This influence can modify the way the individual behaves, thinks and sometimes even feel.
Peer pressure and it's ocurrence reveals the fact that individuals tend to want to fit in within their groups and thus conform to the norm of said groups.
In this particular case, the fact that Callies behavior was affected by the call that she had with her friend Sue, shows a degree of peer pressure.