Freud got the idea that if hysterical symptoms could be removed by hypnotic suggestion, then they must be?

c) Psychological in Nature

By seeing that some patients with hysterical symptoms might be made to feel better through hypnotic suggestion, Charcot came to the conclusion that the symptoms were not brought on by a physical ailment or damage.
Freud eventually built on this idea and developed the concept of the "psychic apparatus," which he believed was responsible for generating psychological symptoms. According to Freud, these symptoms were the result of suppressed conflicts and traumas that were too difficult for the conscious mind to cope, and hence were manifested in bodily symptoms or other forms of behavior.
In conclusion, Freud's development of psychoanalytic theory, which emphasized the role of the unconscious mind and repressed psychological conflicts in the development of psychological symptoms, was greatly influenced by Charcot's observation that hysterical symptoms could be alleviated through hypnotic suggestion.