Answer: A. Spontaneous recovery, B. Acquisition, C. Extinction, D. Generalization, E. Discrimination.
Explanation: The concepts that are part of classical conditioning are matched to the descriptions.
A. The return of the conditioned reflex after it has been extinguished - <u><em>Spontaneous recovery.</em></u>
B. Developing a learned response to a stimulus, that previously caused no particular response - <u><em>Acquisition.</em></u>
C. Unlearning a conditioned reflex through the lack of pairing a stimulus with one that produced the reflexive response - <u><em>Extinction</em></u>.
D. When a conditioned reflex is also generated when similar but not the same stimulus is presented - <u><em>Generalization.</em></u>
E. When the learner is able to tell the difference between two similar stimuli and only responds to the exact one that produced the desired result - <u><em>Discrimination.</em></u>