I would say either A or C, but i'm not positive, my research didn't tell me much, sorry!
The Mita system was a mandatory public service in the society of the Inca Empire. Historians use the haspancized term mita to differentiate the system as it was modified by the spanish colonial government.
It increased as it could have prevented multiple diseses by just insterting a syringe in a soldier's arm.
<span>The Molotov–Ribbentrop Pact, also known as the Nazi–Soviet Pact, the German–Soviet Non-aggression Pact or the Nazi German–Soviet Pact of Aggression</span>