B. The United States is a representative democracy; ancient Greece was a direct democracy.
Explanation:
Although the Founding Fathers of the United States were deeply inspired by the ancient Greece's form of government, the main difference between both democracies is that the United States has a representative democracy; also known as democratic republic, <em>American citizens elect their representatives (President, Senators, members of the Congress) to represent the citizens' interests</em> and protect their rights in the government, while the ancient Greece had a direct democracy,<em> citizens would gather together on assemblies and were allow to vote on any government issue, like passing laws or making decisions. </em>