Carol Has Spent $2000 Purchasing and Repairing an Old Car

Carol has spent $2000 purchasing and repairing an old car, which she expects to sell for $2400. She discovers that she needs an additional repair, which will cost $400. She can sell the car as it is now for $2000. What should she do?

A) She should sell the car now for $2000.
B) She should never sell something for less than it cost.
C) She should complete the repairs and sell the car.
D) It doesn't matter which action she takes; the outcome is the same either way.