in classical conditioning is the weakening of the conditioned response when the unconditioned stimulus is absent.

The answer is extinction.

Explanation:

In terms of operant conditioning, extinction takes place when a response is not reinforced according to a discriminative stimulus.

Some factors influence how resistant a behavior can be to extinction. It is said that the strength of the original conditioning is usually important. Those behaviors that are well established could be impenetrable regarding extinction, and they could be performed even after there is no reinforcement. Some research has shown that habituation could have an important role in extinction.  

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it should be d or b but i'm sure it's d