参考答案

正确答案：B
解析：细节题。根据题干信息词environmental regulation定位到第五个小标题末句Some environmental regulation may be too cumbersome (麻烦的) and needs to be streamlined--standards can vary wildly between regions—but there isn't any doubt that environmental regulation actually works，即：虽然有一些麻烦，但是环境规则还是有作用的，故选B。