Although frieda is typically very reserved, as part of a huge rock concert crowd, she lost her inhibitions and behaved in a very sexually provocative way. frieda's unusual behavior is best understood in terms of:
a) the bystander effect.
b) social facilitation.
c) deindividuation.
d) the mere exposure effect.

c) deindividuation.    

Explanation:

Deindividuation: In social psychology, the concept of deindividuation is defined as an individual's loss or mislaying of self-awareness in specific groups and this often leads to resistance.

Example: A person who is experiencing deindividuation is often involved in groups like gangs, cults, etc.

According to the psychologists, not all kind of deindividuation or people experiencing it is considered as a bad or unwanted thing.

answer; self-efficacy;