An observer stands 20 m from the bottom of a Ferris wheel on a line that is perpendicular to the face of the wheel, with her eyes at the level of the bottom of the wheel. The wheel revolves at a rate of a rad/min and the observer's line of sight with a specific seat on the Ferris wheel makes an angle 0 with the horizontal (see figure). At what time during a full revolution is 0 changing most rapidly? * rad/min 20 m Choose the correct answer below. O A. The angle 0 is changing most rapidly when the seat is at its rightmost point. O B. The angle 0 is changing most rapidly when the seat is at its leftmost point. OC. The angle 0 is changing most rapidly when the seat is at its highest point. D. The angle 0 is changing most rapidly when the seat is at its lowest point.