What factors explain the major increase in population in half of China and a much smaller change in the other half?

an invasion from the north and rich farmland to the south
an invasion from the south and rich farmland to the north
overland trade and urbanization
seagoing trade and urbanization

Question

What factors explain the major increase in population in half of China and a much smaller change in the other half? 
 	
	an invasion from the north and rich farmland to the south
	an invasion from the south and rich farmland to the north
	overland trade and urbanization
	seagoing trade and urbanization

anonymous · Answer

attachment

anonymous · Answer

http://www.brookings.edu/research/articles/2010/09/china-population-wang doesthis help?