Cognitive dissonance is a state of conflict experienced by a person after making a decision, taking action, or coming into contact with beliefs that violate their original beliefs, emotions, or values. When people feel cognitive dissonance, an uncoordinated presence will promote People try to reduce inconsistencies. In addition to trying to adjust their behaviors or changing their attitudes, people can also actively avoid domestic and foreign factors and information factors that are likely to increase disharmony. Based on the above definitions, Which of the following reflects cognitive dissonance:. ['Xiaoming participated in a very boring activity and received very little compensation from it.', "The salesman convinced Xiaohong to buy kitchenware that she didn't really need at a relatively high price. A few days later, Xiaohong felt that she liked the kitchenware very much.", 'Xiao Wang was criticized by his father for failing to take the exam. After returning to his room, he seriously thought about the reason and decided to study harder in the future.', 'Diligent Xiaoyu participated in many extracurricular classes, which caused him to be late every time he practiced the piano. He was very sorry to the piano teacher.']