Idris transfers to a new university during his junior year. His family has a history of alcoholism so he has avoided drinking in the past, but his new friends pressure him to drink at social events. He is afraid of social rejection so he decides to drink, but still privately feels that drinking is problematic. What terms best describe the change in Idris' behavior?

The term that best describe the change in Idri's Behaviour is Normative conformity and compliance.

Explanation:

In psychologial terms, Normative conformity is described as change in an individual in it's attitude or behaviours that is made to fit in a determined social group, in this case, Idris in order to fit in the group he decides to drink fearing social rejection. Also, Compliance is defined as a change in one's attitude or behaviour while still not actually wanting to or disagreeing with the social group, in this case, Idris decides to drink even though he still feels that drinking is problematic, therefore also Compliance is present in his behaviour.