单选题 A small population may mean ______.

A、 higher productivity, but a lower average income
B、 lower productivity, but a higher average income
C、 lower productivity and a lower average income
D、 higher productivity and a higher average income

【正确答案】 D

【答案解析】[解析] 由文中第一段第四句Thus，each person produces less…a lower average income than could be obtained with a smaller population可以推断出：人口少意味着更高的生产力和人均收入，故选D。