Stewart's wife has been nagging him to stop flirting with other women and pay more attention to

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Question:

Stewart's wife has been nagging him to stop flirting with other women and pay more attention to her. Finally, in order to stop the nagging, Stewart starts and continues to devote all his time to her. From the point of view of Stewart's behaviour, this is an example of

Positive Reinforcement

Negative Reinforcement

Positive Punishment

Negative Punishment