Answer:
a. trade-offs
c. marginal thinking
Explanation:
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