Answer:
The U.S. Constitution uses federalism to divide governmental powers between the federal government and the individual state governments. The Tenth Amendment tells us that all powers not granted to the federal government are reserved to the states
The most correct answer here would be Eurasia - B
The Silk road expanded all the way from Europe through mainland China. This was a vast network of roads, established trading paths and points along which people were going throuh on their way from either Europe to Asia to trade or the other way around; from different places in Asia to travel to Europe and trade their goods there.
The 3rd state is probably the answer you're looking for
Hope this helps :)
The correct answer is B, A single leader or emperor