Answer:. cognitive dissonance
Step-by-step explanation:
Michael and Joan have resolved the COGNITIVE DISSONANCE they had experienced earlier.
Cognitive dissonance is a condition when a person is having an unstable feelings, thoughts, beliefs or attitudes, that can affect decision making or change of decision.
For instance, someone loves sugary drinks consumption and he or she is thinking about the future implications that too much of sugary contents consumption causes diabetes.
Michael and Joan were experiencing a condition of cognitive dissonance because they are having a second thought on their decision to buy a new house.