When Are Classically Conditioned Responses Most Likely to Decrease I

Multiple Choice

When are classically conditioned responses most likely to decrease i.e., undergo extinction) ?

A) When the unconditioned stimulus is continually experienced in the absence of the conditioned stimulus
B) When the conditioned stimulus is continually experienced in the absence of the unconditioned stimulus
C) When the conditioned response is continually exhibited in the absence of the unconditioned response
D) When, and only when, the conditioned response is not generalized to a new situation