Which item in the list are secondary sources a historian could use to contextualize why a political revolution occurred in egypt in 2011?

ask google there you might be able to find an answer for the question you're trying to ask

(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