When prejudiced people are convinced that other members of their group do not share their prejudice, they tend to become less prejudiced. This is due to .

social influence.          

Explanation:

Social influence: In psychology, the term "social influence" is described as a phenomenon through which a person tends to change or alter his or her behavior in order to satisfy the demands of his or her social environment. Social influence may take different forms and therefore it is often being seen in socialization, persuasion, obedience, conformity, peer pressure, and leadership, etc.

In the question above, the given statement represents social influence.

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