Rick Buys a 1966 Mustang for $3,000,planning to Restore and Sell

Multiple Choice

Rick buys a 1966 Mustang for $3,000,planning to restore and sell the car.He goes on to spend $9,000 restoring the car.At this point he can sell the car for $10,000.As an alternative,he can spend an additional $3,000 replacing the engine.With a new engine the car would sell for $13,000.Rick should

A) complete the repairs and sell the car for $13,000.
B) sell the car now for $10,000.
C) never try such an expensive project again.
D) be indifferent between (i) selling the car now and (ii) replacing the engine and then selling it.