answer this, please?

Sidney made root beer floats for her friends when they came over. The table shows the ratio of cups of ice cream to cups of soda used to make the floats.


Ice Cream (cups) Soda (cups)
3.5 10.5
8 24
12.5 37.5
19 ?


At this rate, how much soda will Sidney use for 19 cups of ice cream?
30 cups
38 cups
57 cups
72 cups