Suppose that during a home visit, you discover the family’s elderly grandfather does not ever smile and mumbles answers. Through research about the family, you discover he has lost all his teeth. After you work with a dentist and get the grandfather dentures, you notice he is smiling during the next visit. What type of reinforcement is demonstrated in this scenario?
A. Positive reinforcement
B. Negative reinforcement
C. Punishment
D. Extinction