Answer:
The answer is C. id.
Explanation:
According to Freud, personalities are built upon three fundamental structures: the Id, the Ego and the Supergo. The Id is the only structure that's present from birth. It is driven by instinct and immediate pleasure. It is responsible for hunger and sexual desire, for example. However, the impulses of the Id are often socially unacceptable, so they must be regulated by the Ego, which provides more realistic courses of action.
