Ego means:

A) center.
B) self.
C) mind.
D) personality.

Ego

A component of Sigmund Freud's psychoanalytic theory, representing the realistic part of the psyche that mediates between desires and moral constraints.

Self

Pertaining to the individual person, often in reference to one's own thoughts, feelings, or actions.

Mind

The element of a person that enables them to be aware of the world and their experiences, to think, and to feel; the faculty of consciousness and thought.