Which of the following best represents angular motion?

Angular motion refers to the rotation of an object around a pivot point or axis. In the context of physical activity, elements of human movement that involve rotation about joints can best exemplify this concept.

The knees of a cyclist exhibit angular motion during pedaling, as they move in a circular path around the hinges of the joints while the cyclist pedals. Similarly, the arms of a swimmer also demonstrate angular motion as they move in sweeping arcs during strokes, rotating around the shoulder joints.

Both examples illustrate how angular motion occurs in different sports activities—cycling and swimming—where the movement around a fixed point (i.e., the joints) creates rotational dynamics. Hence, the correct choice encapsulates the essence of angular motion through these two distinct activities.