How is the airspace usage in a Restricted area defined?

The airspace usage in a Restricted area is defined as being limited to specified purposes that may include hazardous activities. This designation allows for certain operations, such as military training, testing of weapons, or other activities that could be hazardous to non-participating aircraft. The nature of the activities in restricted airspace imposes restrictions to ensure safety for both military and civilian operations.

Unlike unrestricted airspace, where any aircraft can operate freely, or airspace designated specifically for commercial flights, restricted areas have clearly defined boundaries and specific usage protocols. This ensures that civilian aircraft are kept at a safe distance from potentially dangerous activities occurring in that airspace. Therefore, option C accurately captures the essence of airspace restrictions and the safety measures in place to manage such areas effectively.