Answer: alternative D.
Explanation: The animals that go through this process understand that everytime they drink the unusual-tasting liquid they will be injected, being that a very unpleasant series of events. They are conditioned, therefore, to be afraid of the unpleasantness of this process by associating pain to the actions that are part of it.
A. Posting an intentionally hurtful or mean comment on someone's social media and being blocked from that account.
B. Posting photos or videos of yourself doing illegal activities (drinking while underage, doing drugs, etc.). Companies and colleges look at your social media to see what you are really like, which could lead to not being accepted into a college or being kicked out of a sports team.
