What is the contrapositive of the following conditional statement? "If I won the lottery, then I would buy a car. "  

A. If I bought a car, then I won the lottery.  

B. If I did not buy a car, then I did not win the lottery.  

C. If I did not win the lottery, then I would not buy a car.  

D. If I won the lottery, then I would buy a car. ​