Answer: A) stimulus generalization
Explanation: stimulus generalization is the likeliness or tendency to react or respond in thesame manner to different but similar stimuli.
stimulus generalization tends to happen in both operant and classical conditioning events.
For example a cat is taught to flip over when it hear a loud tone, it's likely that the same cat will flip over when it hears that same tone even if it's not loud.
This is a good illustration of stimulus generalization.