Answer:
c. anhedonia
Explanation:
Anhedonia: The term anhedonia is described as an individual's loss in the capacity or probability to experience pleasurable experience. An individual experiencing anhedonia unable to acquire pleasure from the activities that he or she used to enjoy formerly.
Anhedonia is considered to be as the typical clinical feature of schizophrenia, depression, and other mental illnesses.
In the question above, Stuart is experiencing anhedonia.