Answer:
The correct answer is E
Step-by-step explanation:
Cognitive dissonance is the situation or circumstance which occur or happen when a person or an individual holds two or more ideas, values or beliefs which are contradictory or participates in action which might go against one of the three elements.
So, in this case, the sales person, who made a sales through selling a car to customer, tries to reinforce the fact by asking after 2 weeks, that they made a smart investment. Therefore, he is trying to reduce or decrease the cognitive dissonance.