Answer: Superego
Step-by-step explanation: According to the theory of Freud , superego is defined as the internal personality trait which an individual attains from parents,elders society etc. It does not let the ego behave in aggressive manner rather it makes the person think in ideal and moral way .
The situation mentioned in the question describes about Armand persisting superego value which is he has gained from his parents and thus he felt guilty in going to party with the supervision of his parents.