Answer:
Foot-In-The-Door Phenomenon.
Step-by-step explanation:
Based on the scenario being described within the question it can be said that this scenario best exemplifies the Foot-In-The-Door Phenomenon. This phenomenon refers to the tendency in which an individual complies with a certain large request after agreeing to a smaller request. Which is what happened in this scenario since Alisa ultimately agreed to help Rodrigo with his exhibit after getting interested in it, which only happened because she agreed to go help him buy materials at the store.