Final answer:
Flo and Carl's motivation for cutting grass is extrinsic because it is driven by the payment they receive, rather than personal satisfaction or enjoyment from the task itself.
Step-by-step explanation:
The motivation that drives Flo to cut the grass because she receives payment is considered to be extrinsic motivation. This is because her motivation comes from outside of herself, specifically the monetary compensation she gets for the work. It contrasts with intrinsic motivation, which stems from within an individual, such as the joy or satisfaction derived from performing an activity. To answer the question presented, Carl mows the yard of his elderly neighbor for $20, which means he is also motivated extrinsically. Factors such as verbal praise may influence intrinsic motivation, but in Flo and Carl's cases, their primary motivator is the payment they receive, which is an external reward.