Final answer:
Cognitive Restructuring is the method used to assist clients in identifying and challenging negative or dysfunctional beliefs, which is part of cognitive-behavioral therapy. Hypnosis is effective for those open to suggestion. Cognitive dissonance explains the discomfort from inconsistent behaviors and beliefs.
Step-by-step explanation:
To assist clients in identifying and challenging negative or dysfunctional beliefs, therapists may employ techniques such as Cognitive Restructuring. This method is a part of cognitive-behavioral therapy, which takes into account both cognitive processes and behaviors in psychotherapy. In the context provided, Cognitive Restructuring corresponds to the answer choice C) Cognitive Restructuring Support.
Regarding the modality that is most effective in individuals who are very open to the power of suggestion, the best answer is hypnosis. It is a method that can significantly influence cognitive and perceptual processes in highly suggestible individuals.
The concept of cognitive dissonance also plays a crucial role in understanding how our beliefs are affected when we experience threats to our self-esteem or positive self-image, as described by psychologist Leon Festinger.