What term describes the facilities provided for passengers at an airport?

The correct answer is the terminal building. This term refers to the main structure at an airport where passengers arrive and depart. The terminal building houses essential facilities such as ticketing counters, check-in areas, security screening, baggage claim, and boarding gates. It is designed to accommodate the needs of travelers, providing access to various amenities like shops, restaurants, and services.

The other options do not pertain directly to passenger services. The air traffic control center is responsible for managing aircraft movements and ensuring safety in the airspace. The cargo terminal building focuses on freight and shipping rather than passenger services. The runway construction site relates to the infrastructure of the airport but does not offer facilities for travelers. Understanding this distinction helps in appreciating the specific functions of various airport components.