The Juice Cafe posted the sign below showing the prices of smoothies of various sizes.



Which change would make the price of smoothies a function of the size?

A. change the smoothie prices so that each interval between prices is $0.50

B. change the first 12-ounce smoothie to a 10-ounce smoothie so that each smoothie size has only one price

C. change the price of the 22-ounce smoothie to $4.29 so that each price is assigned to only one smoothie size

D. change the 22-ounce smoothie to a 24-ounce smoothie so that each interval between smoothie sizes is 4 ounces