Answer:
b. ego; reality
Step-by-step explanation:
Sigmund Freud, who was one of the famous psychologists has proposed his theory on the psychoanalytic perspective of personality in which he has mentioned three stages of personality including id, ego, and superego.
Ego: According to Freud, the ego is based on the reality principle that indicates an individual experiencing "ego" has overcome the effects of the id and is now ready to face reality. Ego influences an individual to react according to some rules which are being validated by society. In the stage of ego, an individual learns all his desires and urges can not be fulfilled instantly.
In the question above, According to Freud, Dan's ego that is being operated on the reality principle.