选择题
1999 AMC 8 Problem 15: Extra License Plates
Bicycle license plates in Flatville each contain three letters. The first is chosen from {C, H, L, P, R}, the second from {A, I, O}, and the third from {D, M, N, T}. Flatville adds two new letters. Both new letters may be added to one set, or one may be added to one set and one to another set. What is the largest possible number of additional license plates that can be made?
A.
24
B.
30
C.
36
D.
40
E.
60