Classically conditioned learning will fade or become extinct if it is not

A) punished.
B) reinforced.
C) ignored.
D) dishabituated.

Classically conditioned learning is maintained through reinforcement, so it will eventually fade or become extinct if there is no reinforcement. Punishment may suppress behavior, but it does not necessarily lead to extinction of the learned response. Ignoring the behavior will not lead to extinction, as the absence of reinforcement must be present for extinction to occur. Dishabituation is a separate concept and not directly related to the extinction of classical conditioning.