Which of the following was believed to be a group at high risk for aids in the early 1980s?

(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

the answer for 3 is b and the answer for 4 is d