Correct Response: C. The elbow is a pivot joint. A pivot joint is a type of synovial joint that includes two or more bones that are covered with slippery cartilage at each end. They have a cylindrical bone that rotates inside another bone, which forms a ring around it.
With the elbow, the radius rotates around the ulna when the hand is turned inward or outward.
The shoulder joint has a ball and socket joint (A) that has the most range of motion around its axis. The knee has a hinge joint (B) that allows movement in one direction or one plane, and the wrist has gliding joints (D) in which one bone glides over another for a limited range of motion
