Class D airspace is typically defined as which of the following?

• A. Surface to 2,500 ft AGL with about a 4-mile radius around an airport with a control tower.
• B. Surface to 5,000 ft AGL around every towered airport.
• C. Above 18,000 ft MSL around airports with radar.
• D. From 3,000 ft to 7,000 ft around non-towered airports.

Answer: (A)

Class D airspace is the controlled airspace around airports that have an operating control tower. It typically extends from the surface up to 2,500 feet AGL and covers about a 4-mile radius around the airport. This configuration is designed to provide separation for instrument and VFR traffic as it transitions near the airport while the tower is in operation. You must establish two-way radio communication with the tower to enter this airspace, and procedures vary if the tower is closed.

The other options don’t fit because they describe different airspace or different extents: Class B/C/A concepts or incorrect vertical limits, or airspace associated with non-towered airports rather than a towered one.