The correct answer is - C. A queen dies, and her son becomes king.
The hereditary change in leadership is most commonly represented in the monarchies and the dictatorships.
The monarchs, as well as the dictators, tend to keep the leadership of the country in the closest circles of their families, so in general, it is the sons, and occasionally the daughters, of the leaders, that take charge of the country once they are dead or willingly retreat.
Nowadays, this system is not practiced in lot of countries around the world, and most countries stride towards democracies.
