Leon Festinger posited that we engage in comparison, evaluating ourselves in relation to our peers of similar status, similar characteristics, or similar qualities.

social

Explanation:

Leon Festinger presented this human psyche ans said that its human nature that he compare and rank herself with society members and concerned group. People compete, observed and performed on basis of social comparison. it motivates and encourage human to compete and get a better social rank in social groups. human compare and ranked themselves with similar peers and similar class and it effect our human memory, behavior , performance.  

answer; ///(3) three parts;

answer; /// the above statement is (true);