The Mongols brought a lot of change to China. They undid the long-standing dynastic system of Chinese government and changed the system of government, getting rid of civil service exams that had put government bureaucrats in power.
By annexing Ukrainian land on the Black Sea coast, Putin also annexes the rights to any hydrocarbons found in its maritime zones.
I believe the answer is D. The way the workers were treated by big business and big industry.
