Concept:Port authorities provide facilities for docking, cargo handling, and storage of goods. A tarmac is an airport surface, not a port facility.Explanation:Facilities provided by a port authority include berths, warehouses, and cranes. A berth is a designated place where ships can moor and load or unload cargo. Warehouses are used to store goods safely before shipment or after arrival. Cranes help in lifting and moving heavy cargo between ships and the dock. A tarmac, however, is an area of ground covered with a hard surface, usually found at an airport for aircraft parking, landing, and takeoff. It is not a facility provided by a port authority. Therefore, among the given options, the facility not provided by the port authority is the tarmac.Answer:C. tarmac