Which of the following is a non-regulatory special use airspace?

Controlled firing areas (CFAs) are indeed classified as non-regulatory special use airspace. This type of airspace is established to contain activities such as live-fire training, and while it may pose hazards to aircraft operating in the vicinity, it does not impose restrictions on the airspace itself. As a result, if an aircraft is operating in a controlled firing area and needs to conduct a maneuver, it has the right to do so because the activities are conducted with consideration not to interfere with non-participating aircraft.

Unlike controlled firing areas, restricted areas and Class B airspace have regulatory frameworks that impose limitations and require coordination with ATC for access. Airport traffic areas also have specific regulations governing their use, as they are designed to manage the flow of air traffic around an airport. The nature of CFA allows for more flexibility, making it a significant example of non-regulatory special use airspace.