Final answer:
Carl Jung rejected many of the sexual aspects of Freud's theory and proposed the concept of the collective unconscious.
Step-by-step explanation:
The individual who rejected many of the sexual aspects of Freud's theory and introduced the concept of the collective unconscious is C) Carl Jung. Jung, like his contemporaries Alfred Adler and Erik Erikson, disagreed with Freud's emphasis on the sexual drive as the main factor driving human behavior. Jung disagreed with Freud's belief that sexual drive was the primary motivator in a person's mental life. Instead, he focused on the collective unconscious, which is a theoretical repository of shared information that Jung believed to be present in everyone. Unlike Freud's idea of a personal unconscious, Jung believed there was more to the unconscious mind, introducing the concept of the collective unconscious, which he thought was a repository of knowledge and images shared across humanity.