Which scenario best represents stimulus pairing?

The scenario where a bell is rung when a snack is presented accurately illustrates the concept of stimulus pairing. In this situation, the bell (neutral stimulus) becomes associated with the presentation of the snack (unconditioned stimulus). Over time, the child may begin to respond to the sound of the bell alone, anticipating the snack, which demonstrates the process of classical conditioning or stimulus pairing. This method can be utilized to enhance the child's response to a desired behavior by linking it with a positive reinforcement, which, in this case, is the snack.

While the other scenarios involve reinforcement or rewards, they do not exemplify the pairing of a neutral stimulus with an unconditioned stimulus in the way that the bell and snack scenario does. The other options focus more on direct consequences of behavior rather than the associative learning that occurs through stimulus pairing.