Which of the following is an example of an activity reinforcer?

An activity reinforcer is a type of positive reinforcement that involves allowing an individual to engage in an enjoyable activity as a reward for a certain behavior. In this context, swinging on a playground exemplifies an activity reinforcer because it is a pleasurable activity that the individual can participate in as a result of exhibiting preferred behavior.

This form of reinforcement is particularly effective as it encourages the repetition of the desired behavior by associating it with a fun or highly valued activity. The other options, while they may also serve as reinforcers, fall into different categories. For instance, receiving candy is a tangible reinforcer, verbal praise is a social reinforcer, and physical toys represent material reinforcers. These do not involve the direct engagement in an enjoyable activity like swinging does, making it a standout example of an activity reinforcer.