Final answer:
According to Carl Jung, the formation of complexes in the personal unconscious is mainly influenced by individual experiences. The answer is option D.
Step-by-step explanation:
The formation of complexes in the personal unconscious of an individual, according to Carl Jung's belief, is primarily influenced by individual experiences.
Jung proposed that individuals accumulate experiences throughout their lives, which contribute to the formation of complexes in the personal unconscious. These complexes represent emotionally charged patterns of thoughts and behaviors that arise from past experiences and have a significant impact on an individual's behavior and perception.
While social conditioning, genetic inheritance, and the collective unconscious also play a role in shaping an individual's psyche, Jung emphasized the importance of individual experiences in the formation of complexes in the personal unconscious.