<span>the best option is B
the development of more efficient agriculture
The emergence of efficient forms of agriculture especially in Mesopotamia, led to emergence of early city states as food was produced in surplus to feed the town population. it also led to division of labor. this form of agriculture also contributed to sedentary lifestyle and improved nutrition thus explosive population that contributed to city establishments.
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The description best fits the kingdoms of Ghana and Songhai is the trading states of West Africa. Back then, the kingdom of Ghana and Songhai was really famous around the world for their Gold Resources. A lot of European merchants came to these kingdom to do a trade
I can confirm the answer is A. federalism
i think its A but im sorry if im wrong bby
