Answer:
conditioned stimulus
Step-by-step explanation:
In psychology, the conditioned stimulus is one of the influencing factors in the classical conditioning theory which was proposed by Ivan Pavlov in an attempt to experiment on dogs.
Conditioned stimulus refers to a formerly neutral stimulus which is responsible for triggering a particular conditioned response after getting connected with an unconditioned stimulus.
In reference to the question above, for Allen, the door to the restroom has become a conditioned stimulus.