Answer:
A conditioned response
Explanation:
A conditioned response is a reflex action or behaviour that has been learned or mastered over a period of time following a repeated witness of a neutral stimulus and a potent stimulus. Conditioned response is a type of classical conditioning concept proposed by Ivan Pavlov. He noted that individual respond with some kinds of behavior as a result of some particular kinds of stimulus cues.
In this question, Diane has been configured to twitch (reflex behaviour) over time to the sound of a toilet flushing