Final answer:
Freud posited a perpetual conflict within our personality between the id's primitive drives and the superego's moral standards, with the ego mediating between them. The correct answer is D. id, superego.
Step-by-step explanation:
In Freud's view, there is a continuing battle between two parts of the personality - the id and the superego. The unconscious id contains our most primitive drives or urges, and seeks immediate gratification of these, operating on the "pleasure principle." The superego develops through social interaction and internalizes societal rules for right and wrong, acting as our conscience and moral compass. It is the ego's job to balance the demands of the id and superego, operating on the "reality principle." Therefore, the correct answer is D. id, superego.