Final answer:
Charlotte is intrinsically motivated to play with her doll, as she does it for her own enjoyment, unlike Carl, who is extrinsically motivated by money to mow a yard. Intrinsic motivation can be compromised by external rewards, resulting in the overjustification effect.
Step-by-step explanation:
Charlotte spends hours at a time playing with her doll, Emma, because she finds joy and satisfaction in the process itself. Therefore, Charlotte is intrinsically motivated to play with Emma. In contrast, if Charlotte was doing this activity for a reward or recognition from others, she would be extrinsically motivated. For example, Carl mows his neighbor's yard each week for $20, which is an extrinsic motivation because he is driven by the reward of money. Similarly, if a child played nicely with the doll due to enjoyment from the activity itself, that would also be intrinsic motivation. Intrinsic motivation can be affected by external rewards, leading to the overjustification effect where the intrinsic desire to perform an activity is diminished when extrinsic rewards are given.