What is the airspace limit in Class C airspace at the bottom level?

The bottom limit of Class C airspace is established at 2,500 feet above ground level (AGL). Class C airspace typically extends from the surface up to 4,000 feet AGL. The dimensions of Class C airspace are designed to provide a controlled environment for airport traffic management, particularly around airports with a reasonable volume of traffic.

In Class C airspace, the controlled airspace begins at the ground level and extends vertically to the ceiling, which is usually at 4,000 feet AGL. The designation of 2,500 feet AGL as the lower limit is significant, as it ensures that lower altitude operations, such as general aviation and small aircraft operations, can be conducted safely without immediate interference from higher altitude traffic.

Though other options present higher altitudes, they go beyond the lower limit established for Class C airspace, which can be misunderstood when considering the structure of different classes of airspace and their respective vertical limits.