Refer to the Following Description of a Dog Training Procedure

Multiple Choice

Refer to the following description of a dog training procedure to answer the questions that follow.
Clicker training, which involves pairing a metallic clicking sound with a food treat, is used in training animals. Initially, the click is meaningless, but as the number of click-food treat pairings increases, the animal (e.g., a dog) appears to develop an expectation that a click signals a food treat. Thus the dog approaches, looks at the handler, and appears excited (e.g., wagging tail, drooling, etc.) .
-One explanation of what is learned in classical conditioning studies is that the subject forms an association between the clicker and the food treat. Thus the training illustrates the phenomenon of _______ learning.

A) R-S
B) R-R
C) S-R
D) S-S