Sometimes at sporting events people will behave in a loud and reckless manner even though they would never behave that way if they were alone. what phenomenon does this illustrate?

This phenomenon would illustrate deindividuation. Deindividuation is when a person joins a group and then takes on the group's identity and behavioral attitudes. The person might then carry out actions or take certain view points that the group has even though it is something they would not normally do by themselves.

Ibelive the answer is a