I believe the answer is A. An 8-hour day. Hope this helps.
While most African Americans serving at the beginning of WWII were assigned to non-combat units and relegated to service duties, such as supply, maintenance, and transportation, their work behind front lines was equally vital to the war effort.
The answer would be the amount of resources consumed during production.
Toussaint Louverture led a successful slave revolt and emancipated the slaves in the French colony of Saint-Domingue (Haiti). A formidable military leader, he turned the colony into a country governed by former black slaves as a nominal French protectorate and made himself ruler of the entire island of Hispaniola.