I believe the answer is (B) Minorities
Answer:
increased number of workers
Otrar-- located in central Asia, north of the Indian peninsula.
Genghis Khan organized and led the Mongols through an Asian conquest in the 13th century. After conquering China, the Mongols moved west taking over central and western Asia. The city of Otrar was conquered in 1219, four years after the conquest of what is now Beijing. The city held on in defense for months but eventually fell with the leadership surrendering.
Harry S Truman The Buck Stops Here means I'm the ultimately responsible person in this organization. Other people can pass the buck to me, but I can't pass the buck to anyone else.
The answer is "amend". Think of the amendments ^^