Answer:
The conditioned response is a feeling of nausea.
Explanation: Conditioning is the phenomenon whereby a response or reaction is associated to a particular stimuli.
For example when a dog salivates at the sound of a bell, because it has been conditioned to expect food whenever it hears the sound.
Therefore in the case of Luna above, because she threw up after drinking Gatorade, she has associated the response of throwing up to the taste of Gatorade, and even the sight of the bottles evoke the reaction of nausea. This means that Luna has been conditioned to feel nauseous when she sees Gatorade.