The correct answer is: The designers of the government borrowed elements of these governments in structuring the U.S. federal government.
The framers of the U.S. Constitution were influenced by the democratic principles of ancient Greece and the republican ideas of ancient Rome. They incorporated concepts such as a written constitution, checks and balances, and the separation of powers, which were reflective of both Greek and Roman political thought. However, they did not replicate the structures of those ancient democracies entirely, as they aimed to create a system that addressed their own historical, social, and political context.