GWD错题吧？

6-6The ratio of the number of red cars in a certain parking lot to the number of black cars is 3 to 8.  If there are 72 black cars in the lot, how many red cars are there in the lot?

A.     11

B.     15

C.     24

D.     27

E.      32

答案是C，但我觉得应该是D吧？如果没错的话，上来确认下，大侠们请路过的时候顺便给我看看咯。