Answer:
B) higher order conditioning (second-order conditioning).
Step-by-step explanation:
Higher-Order Conditioning: In psychology, the term higher-order conditioning is also referred to as second-order conditioning which is a part of the classical conditioning theory, and is defined as a particular situation in which a specific stimulus that has been formerly a neutral stimulus is being paired or connected with a conditioned stimulus or CS to produce or create the exact same condition response as the CS or conditioned stimulus does.
In the question above, the experimenter has demonstrated the higher-order conditioning.