The correct answer is "C".
The Enlightenment was an intellectual and philosophical movement that was predominant in Europe during the 18th century. It is also known as the Age of Reason, due to the fact that many intellectuals started questioning traditional beliefs and proposing methods such as observation to find an explanation to the phenomena that occurred in the world.
The idea that this movement proposed paved the way for a series of political revolutions, that started with the French Revolution in the latter part of the 18th century and spread throughout Europe.