Which of the following is a con for using tangible reinforcers?

The correct choice identifies "Cost" as a con for using tangible reinforcers because tangible items often require financial resources to obtain and maintain. Using tangible reinforcers can lead to increased expenses, particularly if the reinforcement must be provided frequently or in large quantities to maintain effective behavior change. This financial consideration can limit the practicality of implementing a behavior modification plan over the long term.

In contrast, satiation refers to the potential decrease in the effectiveness of a tangible reinforcer as it is presented repeatedly. Although it is a valid concern, it may not directly reflect a con that would impact feasibility or sustainability like cost does. Immediacy relates to how quickly a reinforcer follows a behavior and is generally seen as a positive aspect of reinforcement strategies, helping to ensure that the connection between behavior and consequence is clear. Naturalness pertains to how closely a reinforcer resembles real-life situations, which is often desirable but not inherently negative. Thus, while other concerns exist in the context of using tangible reinforcers, cost stands out as a significant drawback.