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The graph below shows the numbers of cups of kiwi juice that are mixed with different numbers of cups of lemon-lime soda to make servings of kiwi soda:

A graph is shown. The values on the x axis are 0, 1, 2, 3, 4, 5. The values on the y axis are 0, 4, 8, 12, 16, 20. Points are shown on ordered pairs 0, 0 and 1, 4 and 2, 8 and 3, 12 and 4, 16. These points are connected by a line. The label on the x axis is Lemon-Lime Soda in cups. The title on the y axis is Kiwi Juice in cups.

What is the ratio of the number of cups of kiwi juice to the number of cups of lemon-lime soda?

1:16
4:1
16:1
1:4