What is one characteristic of Class B airspace?

One characteristic of Class B airspace is that it requires VFR (Visual Flight Rules) operations to remain clear of clouds. This regulation is necessary to ensure safety in more congested airspace where air traffic is denser and the risk of collisions with other aircraft is higher. By maintaining a specified distance from clouds, pilots can enhance their ability to see and avoid other aircraft, as well as maintain visual contact with the ground and avoid controlled airspace.

In contrast, other options do not accurately describe Class B airspace. For instance, Class B airspace is not characterized by encompassing many uncontrolled airports; rather, it typically surrounds busy terminal areas with controlled airports. Additionally, Class B airspace is not found primarily below ground level, as it exists above the surface of the Earth, extending from the surface up to a designated altitude. Finally, Class B is not classified as high altitude airspace, as high altitude airspace is generally classified as Class A airspace, which starts at 18,000 feet MSL.