A Giant Wheel, 40 M in Diameter, Is Fitted with a Cage

A giant wheel, 40 m in diameter, is fitted with a cage and platform on which a man can stand. The wheel rotates at such a speed that when the cage is at X (as shown) the force exerted by the man on the platform is equal to his weight. The speed of the man is:

A) 14 m/s
B) 20 m/s
C) 28 m/s
D) 80 m/s
E) 120 m/s