Final answer:
Extrinsic motivation is defined as the pursuit of an activity that decreases internal anxiety.
Step-by-step explanation:
Extrinsic motivation is defined as the pursuit of an activity that decreases internal anxiety.
Extrinsic motivation refers to engaging in a behavior to gain external rewards or to avoid punishment. It is driven by external factors such as money, praise, or recognition. In the context of the question, mowing the yard for $20 would be considered extrinsic motivation because Carl is engaging in the activity for the external reward of money.