1. Given are four sentences on a topic. Some sentences are grammatically incorrect or inappropriate. Select the option that indicates the grammatically correct and appropriate sentence(s).
A. Freud conceded that the human personality is governed by forces called instincts or drives.
B. Later, he came to believe in the existence of a death instinct, or death wish (Thanatos), directed either outward as aggression or inward as self-destructive behavior.
C. He constructed a comprehensive theory on the structure of the psyche, which he viewed as divided into three parts.
D. The id, corresponding to the unconscious, is concerned with the satisfaction of primitive desires and self-preservation.