Daniel and his intramural team just won the co-ed volleyball tournament, and they’re celebrating at an all-you-can-eat pizza place. daniel has had four slices of pizza and is trying to decide whether to have a fifth slice. he does not have to pay for it, but he is thinking about whether the increased calories of the fifth slice are worth it. which foundation(s) of economics is he applying?
a. trade-offs
b. microeconomics
c. marginal thinking
d. the principle that trade creates value

Marginal thinking is when a decision maker evaluates the marginal benefits and marginal cost of a certain activity. Daniel is trying to evaluate if the extra calories (marginal cost) he would get from eating the 5th size of pizza (marginal benefit) is worth it.

Trade offs is also known as opportunity cost. It is what is sacrificed in order to carry out a certain activity. If Daniel eats the pizza, he's sacrificing a more healthy body for the extra slice of pizza.

I hope my answer helps you