The correct answer is D) Citizens are the source of political sovereignty.
The statement that best summarizes the role citizens play in a democracy is "Citizens are the source of political sovereignty."
It was Cleisthenes, the ancient Greek leader, that created democracy, a new political system in which citizens could elect their rulers. It was a great influence on the formation of modern countries like the United States. Democracy relies on the active participation of the citizens who have the right to elect their rulers and representants, and demand the fulfilling of the compromises candidates expressed during their respective campaigns.
The other options of the question were A) citizens are the defenders of the country. B) Citizens are the creators of new democratic principles. C) Citizens are the political representatives of non-citizens.