Read the scenario.
Seth has considered three different ways to spend his Saturday: go to the beach, start on his homework, or mow yards in order to earn extra spending money. Although he enjoys the beach, Seth decides that will be his third choice. He also decides he will have plenty of time to do his homework on Sunday, so he makes that his second choice. It is not too hot outside, so he decides that mowing yards is his best choice.
In this scenario, what is the opportunity cost?
Seeing his friends at the beach on Saturday
Getting his homework done on Saturday
Making money by mowing lawns on Saturday
Buying gasoline for the lawn mower