Donna purchases 10 tickets to a state fair. • She purchases 4 adult tickets for $48.

• The remaining tickets are child tickets, for which she pays a total of $42.

What is the ratio of the price of one adult ticket to the price of one child ticket?

A.
2 to 3

B.
4 to 3

C.
8 to 7

D.
12 to 7