Which radical faction of the French Revolution, led by Jean Paul Marat, Georges Danton, and Robespierre, used violence against their political enemies, culminating in the bloody "Reign of Terror"?

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire