A serf would pay service to pay off a deal or debt and would only be in service for a limited time. Slaves had to serve someone for life without nothing in return
Is there more to the question.?
I think Prim Minister (PM)..........
The most likely answer why Western Europe became so successful in global politics was B - the chinese policy of isolation in my opinion.
China was a very advanced country which was at the same time extremely powerful and vast, putting it mildly. However, their choice of being an isolationist country made room for the smaller European countries to be at the center stage of world politics.
- It created a demand for new raw materials which were often scarce in industrialized countries, thus leading many European nations to build colonies and expand their empires in other continents.
- Mass producing of products, enabling its populace greater mobility in commerce, trade, war, education, etc.
- It assured Western economic and military ascendancy