Nauru

Yaren is correct because Nauru, unusually, has no official capital; instead, Yaren District functions as the de facto seat of government. It hosts the Parliament, presidential offices, and key ministries, clustered near Nauru International Airport on the island’s south coast. Context: Nauru is one of the world’s smallest nations, a single coral island divided into districts rather than cities. A handy memory hook: “Yaren by the runway”—the government hub sits beside the island’s only airport. The other options don’t fit: for example, Yasawa is a Fijian island group, not in Nauru.