Stan Buys a 1966 Mustang, Which He Plans to Restore

Stan buys a 1966 Mustang, which he plans to restore and sell. He anticipates that the cost of the car and the repairs will be $10,000 and that he can sell it for $13,000. When he has spent $10,000, he discovers he needs to replace the engine, which will cost $4,000. He can sell the car without the new engine for $9,000. What should Stan do?

A) complete the repairs and sell the car for $13,000
B) cut his losses and sell the car now for $9,000
C) never try such an expensive project again
D) be totally indifferent between finishing the project and selling the car now