What is the minimum horizontal distance from cloud that must be maintained in a control zone?

The correct minimum horizontal distance from cloud that must be maintained in a control zone is 1 mile. This regulation is based on Visual Flight Rules (VFR) which are designed to ensure that pilots maintain visual reference to the ground while also providing adequate separation from clouds to maintain situational awareness and avoid potential conflicts with other aircraft.

In a control zone, maintaining this distance allows pilots to navigate safely and effectively, ensuring that they can see and avoid other traffic as well as have clear ground references for navigation. This requirement is particularly essential in areas with higher aviation traffic and where cloud formations can create visibility challenges.

The other distances provided are greater than what is required within a control zone, reflecting regulations for environments with different visibility or meteorological conditions rather than the specific requirements within controlled airspace.