Philipe Is a Subject in an Experiment Designed to Imitate

Philipe is a subject in an experiment designed to imitate cheering at an athletic event and is asked to make as much noise as he can by cheering and clapping. In which situation would Philipe likely make the least noise?

A) if he actually is the only person making noise
B) if he is from a collectivist culture
C) if he is in a group of people all making noise at the same time
D) if he believes he is the only person making noise