How do supporting details reinforce the central idea in this passage? These days, scientists are developing new and exciting designs for artificial limbs. Years ago, artificial arms and legs were awkward and stiff. They were often made of wood or other materials that did not look or feel like body parts. Now, some new artificial limbs are not just substitutes for human limbs - they are even better. For example, researchers can design certain kinds of artificial legs to work like the legs of a cheetah - the fastest animal on land. People using these artificial legs can run even faster than people without them. A. The supporting details show why new designs for artificial limbs are better than old designs. B. The supporting details help the reader understand how artificial limbs work C. The supporting details give evidence that cheetahs are the animals best designed for running. D. The supporting details explain criticisms against new artificial limbs.