29 The picture shows a Ferris wheel and a schematic diagram of it with different parts marked. Direction of movement of the Ferris wheel Axis of the Ferris Crossbar from which wheel at the chaircar hangs the centre Chaircar Ferris wheel Schematic diagram of a Ferris wheel Each chaircar hangs from a crossbar. As the Ferris wheel rotates on its axis at the centre, each chaircar remains in an almost UPRIGHT position so that people sitting in it do not fall off. For this to be possible, which of the following is absolutely necessary? A. The chaircars should be fixed rigidly to the crossbar. B. The chaircars should be free to turn about the crossbar. C. The Ferris wheel should always rotate at a fixed speed. D. The Ferris wheel should always turn in the same direction.