Constitutional Monarchy refers to a system of government where the king or queen is the head of state, but their powers are limited by a constitution. Option 1 is incorrect as the King does not write the constitution; it is usually created by a representative body or a group of delegates. Option 2 is incorrect as well because the King does not have the authority to interpret the constitution; this task typically falls under the jurisdiction of the judiciary. The correct answer, option 3, explains that the King exercises power that is granted to them by the constitution. The constitution outlines the scope of the King`s authority and restricts them from acting beyond those boundaries. The King`s power is derived from the constitution, which acts as a framework for governance in a Constitutional Monarchy.