Answer: A) stimulus generalization.
Step-by-step explanation:
The stimulus generalization occurs when a person who was previously associated with a stimulus and had a bad experience is likely to experience worse with a similar stimulus. As the stimulus is like to elicit a response that is same or similar to the previously associated response.
In the given situation the seafood is the first stimulus that crated symptoms of sickness due to food poisoning. The environment of the sea offers a similar kind of stimulus, which will contribute to sickness. Thus the given situation is an example of stimulus generalization.