Stacey's fruit salad recipe uses proportional amounts of different fruits. There are 2 cups of grapes for every 5 cups of pineapple. There are 4 cups of pineapple for every 5 cups of apples. Which equation correctly represents a proportional relationship in Stacey's recipe? A. a = p + 1, where p is the cups of pineapple and a is the cups of apples. B. g = 2.5p, where g is the cups of grapes and p is the cups of pineapple. C. p = 2g + 1, where g is the cups of grapes and p is the cups of pineapple. D. p = 0.8a, where p is the cups of pineapple and a is the cups of apples.