Answer:
I think A.. because all the others are wrong about responsibility
Increase in food crops = multi-level society.
Innovation and technology = non agricultural jobs
multi-level leadership = government formation
growth in resources = population growth
I'm not completely sure, but this is what makes most sense to me.
<span>On June 25, 1950, the </span>Korean War<span> began when North </span>Korea<span>, supported by the Soviet Union and China, invaded South </span>Korea<span>, which was supported by the </span>United States<span>. General MacArthur, leader of the </span>United<span> Nations forces, drove the North Koreans back across the divide, yet encountered a Chinese invasion.</span>