Which was the bloodiest period in the french revolution?
a. the reign of terror

b. the rule of the directory

c. the reign of napoleon i

Correct  

Further details:

The Reign of Terror was a period during the French Revolution when the government used terror tactics to force all citizens of France to show loyalty to the French Republic, which had been established in 1792.  The Committee of Public Safety led the government, headed by Maximilien Robespierre.  The Committee of Public Safety imposed "The Terror" in 1793-94, a program which intimidated citizens into loyalty by punishing any instances of suspected disloyalty.  An enormous number of citizens were executed by guillotine for failing to show full support of the Revolution's goals.

d) all choices are correct

powerful warriors rose to become chiefs, who had a privileged place in society.