To monica overcome her nearly irresistible craving for chocolate, a therapist provides her with a supply of chocolate candies that contain solidified droplets of a harmless but very bitter-tasting substance. this approach to treatment best illustrates:
a) behavior modification.
b) aversion therapy.
c) systematic desensitization.
d) exposure.

Aversion therapy  

Explanation:

Aversion therapy is a type of behavior therapy that is used to avoid unwanted behavior. In this therapy, unwanted behavior is paired with discomfort. A person who is washing hands repeatedly. To stop this behavior therapist used mild electrical current that is used to avoid that unwanted behavior.  

Thus here in the above statement Monica overcome the irresistible craving for chocolate. So that the therapist used a droplet of very less harmful but a bitter taste substance. this is the best treatment of aversion therapy.

its b i looked it up hope u get it right wish u luck