The correct option is:
D. They provided the ideas of natural rights, government by consent, and separation of powers, which promote the greatest possible liberty for the people.
Enlightenment philosophers such as John Locke, Montesquieu, and Rousseau had a profound influence on the Founding Fathers of the United States by advocating for principles that emphasized individual rights, limited government, and the importance of democratic consent in governance. These ideas were foundational in shaping the Declaration of Independence and the U.S. Constitution.