What three of the following proportions is the product of the means equal to 18 ?
A . x/2 = 9/4
B . x/6 = 3/12
C . x/2 = 18/9
D . x/7.2 = 2.5/3
A . x/2 = 9/4
B . x/6 = 3/12
C . x/2 = 18/9
D . x/7.2 = 2.5/3