What is the airspace where activities are controlled to eliminate hazards to nonparticipating aircraft?

The correct choice identifies the Controlled Firing Area as the airspace where activities are managed to reduce risks to nonparticipating aircraft. Within a Controlled Firing Area, operations, such as live-firing or other potentially hazardous activities, are conducted with the understanding that they are not a permanent hazard. When an aircraft is detected in the vicinity, the activities in this area can be halted or adjusted to ensure safety, effectively protecting nonparticipating aircraft.

The nature of Controlled Firing Areas is that they do not require regulatory authority to restrict air traffic; instead, they are activated for specific operations and managed continuously to prevent any hazards to those flying through. The absence of permanent restrictions allows for greater flexibility while maintaining safety for nearby aircraft.

Other types of airspace, such as Restricted Areas and Military Operations Areas, include more permanent restrictions or designated special use airspace that may involve activities posing hazards to all air traffic, necessitating prior authorization to enter. While Special Use Airspace encompasses areas like Restricted Areas and Military Operations Areas, it is not specifically focused on the management of activities to eliminate hazards to nonparticipating aircraft in the same manner as a Controlled Firing Area.