A 25 foot ladder is placed against a vertical wall of a building. The foot of the ladder is 7 feet from the base of the building. If the top of the ladder slips 4 feet, then the foot of the ladder will slide:<spanclass=′latex−bold′>(A)</span>9 ft<spanclass=′latex−bold′>(B)</span>15 ft<spanclass=′latex−bold′>(C)</span>5 ft<spanclass=′latex−bold′>(D)</span>8 ft<spanclass=′latex−bold′>(E)</span>4 ft