Twelve students competed in a dance contest.

Which expression can be used ti determine the number of possible ways the first, second, and third place ribbons can be rewarded?

A. 3 • 2 • 1
B. 3 • 3 • 3
C. 12 + 11 + 10
D. 12 • 11 • 10
E. 12 • 12 • 12 ​