What is a compressed air system primarily used for in medical settings?

In medical settings, a compressed air system is primarily used to power devices that require a pneumatic source. This includes handpieces used in dental operations and syringes that are operated through air pressure. These pneumatic devices rely on the pressurized air supplied by the system to function effectively, allowing for precise control and operation during medical procedures.

While options like providing power to suction devices, delivering oxygen for patient use, and monitoring gas levels in storage containers are important in a medical context, they do not directly relate to the primary function of a compressed air system. Instead, those functionalities are typically associated with other specialized systems or equipment within the medical facility. Thus, the role of a compressed air system as a power source for specific medical instruments solidifies option C as the appropriate choice.