Psychological new ideas like Consciousness, Subconsciousness and Unconsciousness were presented by?

Psychological new ideas like Consciousness, Subconsciousness and Unconsciousness were presented by?
(a) John Dewey
(b) Wundt
(c) Sigmund Freud
(d) Skinner

✅ Correct Answer: (c) Sigmund Freud
Explanation: Freud introduced the concepts of conscious, subconscious, and unconscious levels of the human mind.