The pleasure principle is to the as the reality principle is to the .

id, ego

Explanation:

Pleasure principle : this is the natural way of seeking for pleasure and avoid pain to satisfy biological or psychological needs. pleasure principle is the driving force that guide id

id is the basic part of the personality. It is the primitive part of the mind that contains aggressive and sexual drives and other secret memories

Ego is the essential  part of personality. It is the realistic part that meditates between the desires of the id and the superego

The pleasure principle is to the id as the reality principle is to the ego.

Explanation:

Pleasure principle : Frued conceptualized the pleasure principle as on of the driving forces of id (i-e the primitive, animalistic and instinctual elements of mind also conceptualized by other psychoanalyists as deepest level of unconsciousness)

Reality principle : The reality principle may oppose the pleasure principle , originally proposed by Sigund Frued, that compels people to defer gratification when necessary dut to the obstacles of reality, or for more pleasure/ The reality principle is governed by ego which controls the instant-gratification desire of id.

Hence,The pleasure principle is to the id as the reality principle is to the ego.

Explanation:The pleasure principle is to the id as the reality principle is to the ego.

i would say b. research typically uses a variety of sources