opinion
you can't prove that pigs don't make good pets, its totally subjective
Would say the answer would most likely be A as the European powers fought during the opium wars to plunder china's ports of everything since the Chinese government was unable to control their entire expanse of land.
After that, Liu Bang established the Han Dynasty.
The main way in which major strikes prevented large industrial unions from maintaining power and influence is that they upset the voters, since these strikes often shut down production of many of the goods a large part of the population used.