(C) Two hours after the tank begins filling with water, the rate at which the depth of the water is rising IS increasing at a rate greater than 3 feet per hour per hour. (D) Over the first two hours after the tank begins filling with water, the rate at which the depth of the water i nsing is always increasing at a rate greater than 3 feet per hour per hour. 4. H If dy = x4 - 2x3 + 3x - 1, then y dx dx 3 evaluated at x = 2 is (A) 11 (B) 24 (C) 26 (D) 125