The correct answer is A. Enlightenment.
Explanation
The Enlightenment, also known as the age of reason, was a European philosophical movement during the seventeenth and eighteenth centuries, which stood out for considering reason, freedom and the scientific method as the adequate means to reach knowledge. Also one of its characteristics is the distancing from the religion of many of the thinkers of this time because they considered it a limitation for scientific development. Additionally, it is known as the time when the first revolutions and constitutions of countries such as France and the United States were developed.
On the other hand, the Enlightenment happened last in Europe, as the Renaissance refers to the time between the fifteenth and sixteenth centuries in which there was a transition in Western Europe to the modern era; the reformation refers to the period between the sixteenth and seventeenth centuries in which Martin Luther led a Protestant reform to the Catholic church in Germany that spread throughout Europe and the Middle Ages took place from the fifth century to the fifteenth century. So, the correct answer is A. The Enlightenment.