Tamika Met Samantha, Who Was New to the School

Tamika met Samantha, who was new to the school. Tamika began to develop a friendship with Samantha and soon they became good friends. Then Tamika learned that Samantha had been a troublemaker at her old school. Tamika liked Samantha but now saw her as a troublemaker. Tamika finally resolved these conflicting emotions by deciding that Samantha should be admired for turning over a new leaf at her new school. This is can be explained by

A) implicit egotism theory.
B) groupthink.
C) cognitive dissonance theory.
D) self-perception theory.