Question

spontaneous return of a conditioned response following extinction
spontaneous recovery
programmed instruction
latent learning
reconditioning
reinforcer

Explanation:

In psychology, spontaneous recovery refers to the reappearance of a previously extinguished conditioned response after a rest period or period of lessened response. The other terms - programmed instruction is a method of teaching, latent learning is learning that occurs without reinforcement and isn't immediately demonstrated, reconditioning is the process of conditioning again, and reinforcer is something that strengthens a response.

Answer:

A. spontaneous recovery