Final answer:
The Reign of Terror involved death by guillotine, a swift and relatively painless execution device used during the French Revolution.
Step-by-step explanation:
The first episode in human history known as "the reign of terror" involved death by: c. guillotine.
The guillotine was a swift execution device used during the Reign of Terror, a period of extreme violence and repression during the French Revolution. Approximately 50,000 people were executed by the guillotine during this time, including notable figures such as Georges Danton and Marie Antoinette.
Execution by guillotine was seen as a more humane and efficient method compared to other forms of execution, ensuring that all people sentenced to death experienced the same quick and relatively painless execution regardless of social class.