Question

Brenda is usually a very reserved young woman. when she goes out with her friends one night, her friends start dancing wildly on the dance floor. brenda joins the group, begins to lose her self-awareness, and starts dancing wildly even though it would normally embarrass her. in this situation, brenda's actions are best explained by

Answer 1

I believe the answer is: deindividuation
deindividuation refers to the process when an individual lost his/her sense of awareness  within a social group.
This happen because most people would feel less judgement and constraint if they belonged to a group that accepted them as who they are.