What type of airspace does 'CTR' designate?

The designation 'CTR' stands for Control Zone, which refers to a type of controlled airspace that is established around airports to manage air traffic in proximity to the airfield. This airspace is designed to provide a safe environment for aircraft operating in the vicinity of an airport, facilitating both takeoffs and landings while minimizing the risk of collision.

Air traffic within a CTR is subject to specific regulations and requirements, such as the need for pilots to establish communication with air traffic control and comply with any instructions given. The controlled nature of a CTR means that air traffic controllers actively manage the movement of aircraft, ensuring safe distances between them and offering services like flight clearance and traffic advisories.

By definition, other types of airspace—such as uncontrolled airspace or restricted airspace—do not have the same level of regulation or air traffic control oversight as a CTR, making option B the most accurate answer.