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The recipe for an individual pizza is 1 crust, 1 scoop of tomato sauce, 0.5 cups of shredded mozzarella cheese, and 9 slices of pepperoni. In your kitchen, you have 2 crusts, 4 scoops of tomato sauce, 1 cup of cheese, and 9 slices of pepperoni. Which ingredient is the excess reactant?
A. pepperoni
B. tomato sauce
C. crust
D. cheese