What is the minimum altitude to fly over built-up areas of any city or town?

The minimum altitude for flying over built-up areas of any city or town is set to ensure safety for both the occupants of the aircraft and those on the ground. The correct answer outlines a requirement of flying at least 1,000 feet above the highest obstacle within a specified radius and maintaining a horizontal distance of 2,000 feet from that obstacle.

This regulation is designed to provide a substantial safety margin in the event of an emergency that might require a rapid descent, ensuring that the aircraft maintains a safe altitude to avoid collisions with buildings or other structures. Additionally, the horizontal distance creates a buffer zone to further minimize risk to people and property on the ground.

The other choices do not comply with this standard and, therefore, do not provide the necessary separation from potential hazards associated with urban environments.