Chuck has very strong opinions about his tuition increase. however, when he becomes the student representative for the college board, he develops a more favorable attitude about the tuition increase. which theory best explains his changing attitude?

cognitive dissonance theory    

Explanation:

            Dissonance theory is applicable to all situations that involve attitude change and formation. It is especially applicable to problem-solving and decision-making.

           According to the "cognitive dissonance theory", individuals tends to seek consistency to their cognitions that is opinions, thoughts, beliefs, etc.

           Cognitive dissonance represents the situations that involve conflicting attitudes, behaviors or beliefs.

            In the given context, Chuck had a very strong attitude towards the tuition increase but he started developing a favorable attitude towards tuition increase when he became the student representative. Thus there is a conflict among his attitudes towards the tuition increase.

Hence the answer is --

cognitive dissonance theory