The Deadline for Your Research Paper Is Tomorrow and You

The deadline for your research paper is tomorrow and you still need a day of work to complete the paper.Unfortunately,you are scheduled to work all day in the cafeteria.You can turn the paper in one day late for a 10 percent penalty or take the day off of work and turn the paper in by the deadline.Losing a day of wages will cost you $90.The marginal cost of turning the paper in on time is:

A) 10 percent deducted from your final score.
B) $90 in forgone wages.
C) not getting to lounge around all day.
D) None of these represent the marginal cost.