Elena Changes Her Attitude About Nuclear Weapons After Giving a Speech

Multiple Choice

Elena changes her attitude about nuclear weapons after giving a speech supporting their development to a group of classmates. Brett gives the same speech, but to an empty classroom, and does not change his attitude. The difference between Elena and Brett supports

A) cognitive dissonance theory.
B) impression management theory.
C) self-perception theory.
D) self-affirmation theory.