gwd25-37

lynnx

C正确！

A错误原因：it will have no effect on sport utility vehicles. 这里的it优先指代从句的主语the law。All of which看作插入，则后面的will not be subjected与will have no effect 平行。那么the law will not be subjected to……不符合逻辑。

C：从句中的平行。All of which(指vehicles) are gasoline powered and therefore (are) subjected to emissions-control standards (that are) as stringent as those (指standards) for diesel-powered vehicles.

B错误原因：and前不应加逗号