Select the correct answer. The tables show the subscription costs for two magazines. What is the ratio of the cost of Magazine A to the cost of Magazine B?

Magazine A Magazine B
Duration of Subscription Subscription Cost
(dollars) Duration of Subscription Subscription Cost
(dollars)
12 months 36 12 months 32
24 months 72 24 months 64
36 months 108 36 months 96
A.
9 : 4
B.
9 : 7
C.
9 : 8
D.
9 : 5