【单选题】You have chosen to take a trip during Spring Break. If you had not gone, you would either have worked at a temporary job or studied for exams. The opportunity cost of your trip is
A.
the wages you would have earned from working.
B.
the lower grade earned by not studying.
C.
the wages you would have earned from working and the lower grade earned by not studying.
D.
the value of the trip.
E.
We cannot determine what the opportunity cost is without knowing which alternative, working or studying, you would have preferred.