A solid wheel is being rolled toward the right along a horizontal surface by a force whose line of action is horizontal. The diameter of the wheel is 2.5 ft, the wheel weighs 80 lb, and the magnitude of the force is 15 lb. If the friction force is sufficient to prevent slipping of the wheel on the supporting surface, the magnitude of the linear acceleration of the center of gravity would be A. 3.22 fps per sec. C. 5.15 fps per sec. B. 4.03 fps per sec. D. 6.44 fps per sec.