Answer: a) Posthypnotic suggestions.
Explanation:
Posthypnotic suggestion is defined as the suggestion that is made to perform by the client after getting awake from hypnosis .It is the treatment that helps in performing acts unconsciously when person is out of hypnotic effect.
According to the question, Betty's habit of inhaler usage for asthma is reducing because of the posthypnotic suggestion in which she follows the suggestion of not relying much on inhaler for breathing after awakening.
Other options are incorrect because pre-hypnotic suggestion, para-hypnotic suggestion and hypnotic suggestion are not the factors that makes Betty less reliant on inhaler.Thus, the correct option is option(a).
