Sam offered a treat to her son if he would behave while they shopped for groceries. this treat would most likely be considered a(n) by psychologists.

The treat would most likely be considered as an incentive. Incentives are external motivators. They are used to motivate a change in behavior by means of giving the subject something in return for the change. It can also be used as a means to motivate someone to do something. 

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Hellothe rates at which criminals are rehabilitated into society after their sentencinghope this