Ideas expressed during the Enlightenment led to which of these outcomes?

A. Scientist began to question traditional beliefs about the natural world using reason and observation

B. The rivalry between French and English Enlightenment thinkers led to conflict between these kingdoms.

C. Citizens in some countries launched revolutions that overthrew monarchies.

D. The Catholic and Protestant faiths reformed as a single religion to criticize Enlightenment philosophers.

C. Citizens in some countries launched revolutions that overthrew monarchies.

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.