Concept:The hinterland is the inland region linked to and served by a port.Explanation:A port’s hinterland is not part of the port’s physical structure.It is the surrounding area that supplies goods to the port and receives imported goods from it.This makes the hinterland the entire region that depends on the port for trade.Therefore, the hinterland is best defined as the area served by the port.Answer:D. area served by a port