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A pitcher has 16 cups of water in it. During the day, Aditi drank 21⁄2 cups, Kavitha drank 33⁄4 cups, and Rahul drank 41⁄8 cups. How many cups of water are still in the pitcher? A. 63⁄8 B. 81⁄8 C. 93⁄4 D. 55⁄8