Answer:
B. Grandmother's House; Falling
Step-by-step explanation:
The term conditioned stimulus and unconditioned stimulus is associated with the classical conditioning theory proposed by Ivan Pavlov.
Conditioned stimulus: The term conditioned stimulus or CS refers to the formerly neutral stimulus that triggers a conditioned response after being associated with the UCS or unconditioned stimulus.
Unconditioned stimulus: The term unconditioned stimulus or UCS refers to the stimulus that is responsible for triggering a response naturally, unconditionally, and automatically.
In the question above, the grandmother's house is represented as the CS whereas the falling represents the UCS.