In the given scenarios, the one that represents positive reinforcement is when a child receives a candy bar for finishing their vegetables.
Explanation:
1. Positive reinforcement involves providing a reward or incentive to increase the likelihood of a behavior being repeated.
2. In this case, the child receiving a candy bar for finishing their vegetables is a form of positive reinforcement because the child is being rewarded for engaging in the desired behavior (finishing their vegetables).
3. By giving the child a reward (candy bar), the action of finishing vegetables is reinforced, making it more likely that the child will continue to eat their vegetables in the future to receive the reward.
Therefore, out of the scenarios provided, the one where a child receives a candy bar for finishing their vegetables is an example of positive reinforcement.
