Prep-61.

Which of the following best completes the passage below?

At a recent conference on environmental threats to the North Sea, 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 must, of course, be shown, in order to avoid excessively restrictive controls, is that ___DB___.

(A) any uniform controls that are adopted are likely to be implemented without delay

(B) any substance to be made subject to controls can actually cause environmental damage

(C) the countries favoring uniform controls are those generating the largest quantities of effluents

(D) all of any given pollutant that is to be controlled actually reaches the North Sea at present

(E) environmental damage already inflicted on the North Sea is reversible

这题我在复习的时候又看到了，还是不知道为什么。
BD两项我觉得都是应该需要avoid的，但是答案既然选B，而且我看了大家的讨论帖，貌似没有几个人问D，那么就肯定是我的逻辑思维有问题了，所以请大家指点我一下。
我选的是D，我觉得D也很有道理啊，如果这个污染物质根本到不了北海，也就是说它对北海根本不会有什么污染了，那么你还要control它的排放，有什么作用呢？control它的排放对北海的环境保护有帮助么？我觉得没有诶，那么，他就是不必要的控制了吧？
求指点。