What is the primary purpose of an ATC clearance?

Answer: C — To prevent collision between known aircraft

The primary purpose of an ATC (Air Traffic Control) clearance is to prevent collisions between known aircraft. ATC clearances are essential for ensuring that aircraft operate safely in controlled airspace where numerous flights may occur simultaneously. By providing clearances, air traffic controllers manage the separation and sequencing of aircraft during takeoff, landing, and while en route. This function is critical for maintaining safe distances between aircraft, minimizing the risk of accidents, and facilitating efficient air traffic flow. The ATC clearance includes instructions regarding altitude, route, and timing to ensure that aircraft safely share the skies without risk of collision.