Among all the given scholars, the one who theorized the existence of the unconscious Sigmund Freud. Hence, Option A is correct.
<h3>Who is Sigmund Freud?</h3>
Sigmund Freud gave a psychoanalytic theory of personality. According to Freud, the unconscious mind can be defined as a reserve of feelings. Thoughts and memories that remain that are outside of conscious awareness
When a person is caring and unconscious, it can be viewed by many psychological scientists as a shadow of their conscious mind. There is various evidence that suggests unconsciousness is not identifiable
Thus, it is the Sigmund Freud who theorized the existence of the unconscious. Option A is correct.
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