What does Mode C provide in flight data information?

Mode C provides flight altitude information by transmitting data from the aircraft's altimeter to air traffic control and surrounding aircraft. This capability is crucial for maintaining safe vertical separation between aircraft and for ensuring compliance with airspace rules and regulations. The Mode C transponder sends encoded altitude data, allowing air traffic controllers to track and manage aircraft more effectively, especially in busy airspaces. By relying on this altitude information, controllers can make informed decisions regarding air traffic, enhancing safety and efficiency during flight operations.

The other options do not relate to the function of Mode C. Wind speed measurements, aircraft fuel levels, and route deviation alerts are information types that are not transmitted via Mode C, which specifically focuses on altitude data.