Answer: The correct answer is cognitive dissonance.
Explanation: Cognitive dissonance occurs when there's a situation in which there's a conflict between beliefs, attitudes, and behavior.
The conflict produces anxiety and then the individual either changes his/her behavior or they modify their attitudes or beliefs towards certain behaviors.
Cognitive dissonances also appear when people make bold decisions and then second thought them because they may fear an error of judgment.
In this particular case, Matt and his wife Joan purchased their first home one in a new housing development. Then, dissonance appeared and they began having second thoughts about the decision. Then, they started talking to other couples who had made similar decisions to buy a home in the same area, which lead them to become certain that their decision was the correct one, the result of solving the COGNITIVE DISSONANCE they had experienced earlier.