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B. 31.792.5 cu. ft.Step-by-step explanation:Given,Radius (r) = 15 feetHeight (h) = 45 feetVolume = ?therefore,Volume of a cylinder = π × r² × hTaking π ≈ 3.14..V = 3.14 × 15² × 45V = 31,792.5 cu. feetSo, the cylindrical tank can hold upto 31,792.5 cu. feet of water..___________________________Hope it helps you!!...