Answer:
cognitive dissonance theory.
Explanation:
Cognitive dissonance theory: This theory refers to a situation that involves a clash in the beliefs, attitudes, and behavior of an individual.
Example: A person smokes instead of knowing that smoking causes cancer.
If there is any inconsistency that occurs in the behavior and attitude of a person then cognitive dissonance occurs. And to remove dissonance, the attitude and behavior of a person must be similar.