Final answer:
The Reign of Terror occurred during the French Revolution. It was marked by extreme violence and political purges, leading to the execution of King Louis XVI and thousands of others.
Step-by-step explanation:
The Reign of Terror (1793-1794) was a pivotal period during the French Revolution. This era of radical political upheaval saw the execution of King Louis XVI, leading to a time characterized by extreme measures and violence, aimed at purging France of enemies of the revolution. Key figures like Maximilien de Robespierre drove this period of terror, which eventually culminated in Robespierre's own execution and the subsequent rise of a more conservative government. The correct answer to the question is Option B) The French Revolution.