题目解析:
A 选项用 income 定位到该段第三句:These families were pensioned off (given a sum of money to live on) or simply had their revenues taken away or restricted.对应 A 选项;
B 选项用 their sons 对应该段第三句:...their sons were enticed away to schools for district office later to be posted in some faraway province.对应 B 选项;
C 选项原文中没有提及;
D 选项用 rural population 对应该段倒数第二句:
Local rulers could no longer protect their relatives and attendants in legal cases, and with the ending in 1905 of the practice of forcing peasant farmers to work part-time for local rulers, the rulers no longer had a regular base for relations with rural populations. 对应 D 选项。