The correct option is "B. $10,000; $14,000".
Choosing a car that costs "$10,000" instead of a car that costs "$14,000" means that you'll have more money available for other purchases.
The answer is option B, because if you choose option A, C, or D, you will have no money available for other purchases. And you have to arrange more money for car. But if you choose option B, there are $4000 left for other purchases.