FRENCH REVOLUTION: This was a time during the Free Run there 40,000 people were killed, of which 15,000 were created by the French Revolution Government
A: Scientific Revolution
B: Reign of Terror
C: Day of Reckoning
D: Elsa’s coronation of Arendale

Reign of Terror

Explanation:

Reign of Terror happened in 1793 after the Radical took control over the leadership positions within the French Revolution. This radicals were led by a man named Maximilien de Robespierre

During this time a lot of people within the French Revolutionaries group believed that the monarch has sent its people to inlingtrate the group. As a result, many of them started to threw around accusations, They arrested the people who they believed to be disloyal to the revolutionary cause even without hard evidence.

As a result, around 40,000 were massacred under Robespierre's leadership. The reign of terror lasted until they removed Robespierre from power on  July 1794.