"While Aboriginal Australians and many Native Americans remained hunter-gatherers, most of Eurasia and much of the Americas and sub-Saharan Africa gradually developed agriculture, herding, metallurgy, and complex political organization. Parts of Eurasia, and one area of the Americas, independently developed writing as well. However, each of these new developments appeared earlier in Eurasia than elsewhere." - Excerpt from "Guns, Germs and Steel" by Jared Diamond Based on this description what event can you conclude led to these developments? A) smelting iron B) end of pastorialism C) development of government D) development of agriculture