Select all statements most consistent with the concept of marginalism? (at least two)

a. students who have jobs in college consider the tradeoff between getting an extra hour of studying and earning an extra hour of wages

b. you sign up for a free one month subscription trial but forget to cancel and it auto renews for a one year subscription for $200. the marginal cost for the remainder of the year is 0$

c. As a sophmore in college, the marginal cost of getting you bachelors is four years tuition, four years of missed work expirience and four years of lost earnings through working

d. you purchase a car that is used for 8,000$ instead of a new one that would be $10,000. shortly after you realize the car needs 4,000$ in repairs. the marginal cost to own and repair your car is 12,000 which is a greater cost than buying a new car