Tracy Has an Important Test Tomorrow

Tracy has an important test tomorrow. She knows she should study for the test but she really wants to go to Greg's party. However, when she considers not studying and going to the party she feels guilty. Tracy therefore decides to stay home and study for the test. According to psychoanalytic theory, Tracy's

A) ego won out over her superego.
B) superego won out over her id.
C) id won out over her superego.
D) ego won out over her id.