What was the name of the phase in the French Revolution when the guillotine was frequently used?

A. the Reign of Blood

B. the Reign of Fire

C. the Reign of Terror

D. the Reign of the Republic

The term "The Reign of Terror" refers to a period of time during the French Revolution that marked a frequent use of guillotine in mass and public executions, of those who were then considered to be enemies of the revolution. The death toll shows about 17,000 executions by quillotine during that period. The Terror ends on July 28, 1974 with the Thermidorian Reaction and the execution of several instigators of what is considered the most radical and violent phase of the French revolution.