The base of a 13-ft ladder lleaning against a wall begins to slide away from the wall at the bottom. At the instant in time when the base of the ladder is 12 feet from the wall the base is moving at a rate of 8 ft/sec. How fast is the top of the ladder sliding down the wall at that instant of time? A. 17.5 feet/second B. 19.2 feet/second C. 22.8 feet/second D. 24.6 feet/second E. 26.1 feet/second