Answer:
d. Both A and C
Step-by-step explanation:
Classical Conditioning is a learning strategy in which a person associates a stimulus that was previously neutral and results in a learned response. This stimulus may be natural or unconditional because it automatically starts a response; or it may be conditional, that is, a previously neutral stimulus that now becomes associated with the unconditioned stimulus now starts a conditioned response.
In this scenario, the alcohol plus the drug (stimuli) induce vomiting (response). Therefore, the conditioned stimulus is alcohol, a previously neutral stimulus that becomes associated with the drug, an unconditioned stimulus which, in conjunction, trigger a response: vomiting.