Answer:D) Conditioned response.
Step-by-step explanation:
Conditioned response is the triggered response that is generated when a conditioned response gets linked with an unconditioned response.
According to the question,as Charity has fallen sick due to potato , she experiences a trigger in her stomach due to conditioned response from sight of potato that generates conditioned response in form of sick feeling in stomach.
Other options are incorrect because unconditioned response, conditioned stimulus and conditioned response is not depicted through sick feeling that Charity gets after seeing potatoes.Thus, the correct option is option(D).