Which of the following are sunk, out-of-pocket, or opportunity costs:
a. The amount you will pay to go to the movies next week.
b. The insurance payment on your car last year.
c. The amount of rent you could receive if you were to sublet your apartment and live in a tent for spring term.
d. The difference between the price of a 12-pack of soda at the convenience store versus the price of the same product at the discount warehouse.
e. Tuition payments made this term.
f. Book costs for next semester.