Which position describes lying on the belly?

The correct choice describes the position of lying flat on the stomach, which is known as the prone position. In this position, an individual is oriented face-down, making it commonly used in various medical settings, such as during physical examinations or certain types of surgical procedures.

The supine position, on the other hand, refers to lying on the back, and is distinct from the prone position. Sitting involves being upright, while a reclined position typically indicates a more relaxed state, often with the back at an angle rather than flat on the belly. Therefore, understanding the orientations of these terms is crucial in a medical context for accurately describing patient positions.