Final answer:
Freud believed the mental process must have a source of energy called the c. Id.
Step-by-step explanation:
According to Sigmund Freud, the mental process must have a source of energy called the c. Id. The Id is part of the unconscious mind and contains our most primitive drives or urges, such as hunger, thirst, and sex. It operates on the pleasure principle, seeking immediate gratification.
The job of the Ego is to balance the demands of the Id and the Superego in the context of reality. The Superego acts as our conscience, guiding us on how we should behave based on social rules and norms.