请指教！！！

locklv

这是老题了，但是貌似有答案选D也有选B，有点糊涂了，着急问~请达人指教！！！

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  

(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

genius_fang

应该选B。因为D说这个已经是pollutant了，也就是说control了的话，属于防患于未然，不算过度保护，但是B如果control的话，那就是错杀！

locklv

多谢楼上