Which of the following is a function of body cavities?

The correct answer encompasses all of the functions of body cavities, making it the most comprehensive option. Body cavities serve multiple critical roles in the anatomy and physiology of organisms.

Firstly, body cavities support organs by providing a structured environment that holds them in place. This organization is crucial for the proper functioning of the organs as they perform their respective roles.

Secondly, these cavities provide spaces for movement. For instance, the abdominal cavity allows for the expansion and contraction of organs, such as the stomach and intestines, which is essential for various bodily processes, including digestion. Similarly, the thoracic cavity aids in movements related to respiration as the lungs expand and contract.

Lastly, body cavities protect organs by housing them within flexible yet firm boundaries. This protection is vital against external trauma or impacts, as the cavity walls provide a cushioning effect.

Thus, recognizing that body cavities fulfill all these roles—supporting, enabling movement, and protecting organs—makes the all-encompassing choice the most accurate representation of their functions.