Which answer would correctly go in the area labeled "3" on the graph?

there is no graph, so I can't answer

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

food chain i would say only because there is competition on getting food and survival