Answer:
pizza establishment.
Step-by-step explanation:
Based on the scenario being described within the question it can be said that in this situation the conditioned stimulus is the pizza establishment. That is because a conditioned stimulus is neutral stimulus that triggers a conditioned response after it has been associated with an unconditioned stimulus. Therefore in this scenario the conditioned stimulus is the pizza establishment which causes Vanessa to feel sick every time she sees it (conditioned response).