单选题 Some economists maintain that______.

A、 we will either sacrifice employment for cleaner environment or vice versa
B、 there is no compromise between the government and entrepreneurs or between the latter and the community
C、 the entrepreneurs will need more workers to clean up air and water under the pressure of the government
D、 pollution control will inevitably result in change in demand on the market

【正确答案】 A

【答案解析】最后一段结尾部分，作者阐述了一些经济学家对污染问题的看法：the trade-off is therefore cleaner air and water or more unemployment"交易是要么环境洁净，失业率增加，要么是环境污染，工作正常”，选项A正确。