Currently, the nation-state with the smallest population is Pitcairn Islands. Hence, option D is correct.
What is Pitcairn Islands?
Four archipelagos in the Southern Pacific Ocean try to compensate the Pitcairn Islands, which are officially known as the Pitcairn, Henderson, Ducie, and Oeno Islands. They are the only British overseas territory in the Pacific.
Thus, option D is correct.
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