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When Joan turns the grocery card down the candy aisle, her three-year-old son, Connor, starts screaming, "Want candy! Candy!" Joan moves to another aisle, but Connor continues to scream. As other customers begin staring and Joan starts to feel embarrassed, she finally gives Connor a bag of M&Ms. Connor is now more likely to scream in a store when he wants candy because he has experienced _________________
What is positive reinforcement.