The system of controlling a state decides and vests the power to control it in the hands of a ruler or public or in the hands of elected person by the public.
Monarchy
Monarchy is a system of ruling where the ruler gets the power to rule through heredity. There is a single ruler in the state and the whole control and powers to rule the state are vested in the hands of a single monarch.
These leaders are called kings or queens and they are the sole formulators of laws and rules .
Therefore it cab be said that "In monarchy, the state is ruled by a single person called as a monarch" OPTION D is correct.
Learn more about monarchy here:
brainly.com/question/510165
