Where does the floor of controlled airspace begin over Ft. Worth Alliance Airport?

The floor of controlled airspace over Ft. Worth Alliance Airport begins at the surface, which is why this option is correct. Controlled airspace is defined to provide a safe environment for aircraft operations and to ensure separation from other air traffic. In many cases, it extends from the surface up to a specific altitude, which varies by area and type of controlled airspace.

In the case of Ft. Worth Alliance Airport, the controlled airspace is set to start at the ground level to accommodate various aircraft operations, including arrivals, departures, and general aviation traffic. This surface-level designation is common in busy areas to manage the significant volume of air traffic effectively.

Other altitude-based options, such as starting at 500 feet AGL, 1000 feet MSL, or 2000 feet AGL, would indicate that controlled airspace begins above the surface, which would not facilitate the necessary separation and monitoring of aircraft operations occurring close to the airport. Therefore, these altitude options do not accurately reflect the controlled airspace configuration around Ft. Worth Alliance Airport.