You Have Just Purchased a Car for $20,000 and Realized

You have just purchased a car for $20,000 and realized that you still have to pay for insurance,licence,monthly parking and gasoline.The marginal cost of driving an additional kilometre is the additional money that you have to spend on

A) insurance,licence,monthly parking and gasoline.
B) insurance,licence,monthly parking and gasoline plus the $20,000 purchase price of the car.
C) insurance and licence.
D) monthly parking and gasoline.
E) gasolinE.