Which Pacific island country has a constitutional monarchy?

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Tonga is the Pacific island country that operates as a constitutional monarchy. In this system, the monarch is the head of state, but their powers are limited by a constitution, allowing for a parliamentary democracy to exist alongside the monarchy. This means that while the king has ceremonial duties and some influence, the governance of the country is carried out through elected representatives and governmental institutions established by the constitution.

The other options represent different forms of government. Fiji, for example, has gone through various political changes, including periods of military rule and does not have a monarchy. Micronesia operates as a federal republic, and Palau also has a presidential system. Thus, Tonga's unique blend of traditional monarchy with constitutional governance sets it apart from these other Pacific nations.