A commitment device is defined as:

A commitment device is fundamentally a strategy used to align one's long-term goals with immediate actions, often by creating obstacles or incentives that guide behavior in a desired direction. The correct definition emphasizes the idea that it effectively locks an individual into a particular course of action that may not be their default choice, yet it leads to a preferred or beneficial outcome.

This approach is especially useful in situations where individuals struggle with self-control or when immediate gratification conflicts with long-term aspirations. For example, someone might commit to a gym membership that requires a financial payment upfront to discourage cancellation and ensure regular attendance. By doing so, they are creating a scenario in which they are more likely to engage in a behavior that aligns with their fitness goals, despite any initial reluctance.

The other options, while they touch upon elements of behavior change, do not encapsulate the essence of a commitment device as effectively. They may suggest strategies for change but lack the critical component of binding oneself to a behavior that leads to a more favorable and desired outcome, solidifying the distinct role of a commitment device in behavior management.