Anya was taking some medicine that upset her stomach. later that day, when she drank orange juice, she became violently ill. since then, anya feels sick to her stomach if she even thinks about orange juice. one day when anya is out with friends, the waitress puts a glass of grapefruit juice near her. anya immediately feels sick to her stomach. anya's nausea in response to the grapefruit juice is most likely the result of

stimulus generalization

Explanation:

In stimulus generalization, a stimulus acquires control over a response due to reinforcement in the presence of a similar but different stimulus. Frequently, generalization depends on elements common to two or more stimuli. An example of stimulus generalization is what is happening to Anya. When Anya drank orange juice (stimulation) she felt sick (response), so when she saw grapefruit juice, which is a stimulus very similar to orange juice, she felt sick.