What is one key function of an ARTCC?

Answer: B — Overseeing enroute air traffic

One key function of an Air Route Traffic Control Center (ARTCC) is overseeing enroute air traffic. ARTCCs are specialized facilities within the air traffic control system that manage and coordinate the safe and efficient movement of aircraft that are flying at high altitudes, between airports, during the enroute phase of flight. This oversight includes monitoring flight paths, managing altitude changes, and providing guidance to ensure that aircraft maintain safe distances from each other. The personnel working within ARTCCs are responsible for ensuring that air traffic flows smoothly, providing essential communication and assistance to pilots, and enhancing the overall safety of air travel. While other options may involve facets of air traffic control or airport operations, they do not accurately represent the primary responsibility of an ARTCC, which is specifically linked to managing enroute air traffic.