我对正确答案B没有疑问，但请教答案C错在哪里，看不懂Official Guide后面的解释请大家指点一下
At a recent conference on environmental threats to LACE w:st="on">North SeaLACE>, most participating countries favored uniform controls on the quality of effluents, whether or not specific environmental damage could be attributed to a particular source of effluent. What muse, of course, be shown, in order to avoid excessively restrictive controls, is that______
(C) the countries favoring uniform controls are those generating the largest quantities of effluents
Official Guide后面的解释如下
It would probably help to avoid excessive restrictions if some of the countries producing the most effluents favored uniform controls, it is not necessary that all such countries do.
Ans: B | 
