Since the passage of the state’s Clean Air Act ten years ago, the level of industrial pollutants in the air has fallen by an average of 18 percent. This suggests that the restrictions on industry embodied in the act have worked effectively. However, during the same period the state has also suffered through a period of economic decline. The number of businesses in the state has fallen by 10 percent, and the number of workers employed has fallen by 12 percent. It is probable that the business decline, rather than the regulations in the act, is responsible for at least half of the decline in the pollution.
13. Which of the following, if true, would most seriously weaken the conclusion drawn in the passage above?
(A) During the last ten years, economic conditions in the nation as a whole have been worse than those within the state.
(B) Amendments to the Clean Air Act that were enacted six years ago have substantially strengthened its restrictions on industrial air pollution.
(C) Of the businesses that ceased operating in the state during the last ten years, only 5 percent were engaged in air-polluting industries.
(D) Several large corporations left the state during the last ten years partly in order to avoid compliance with the Clean Air Act.（C）
(E) Due to its small budget, the state office charged with enforcement of the Clean Air Act has prosecuted only two violators of the law since its passage.
明白C的意思，做题时候在C,D间纠缠很久，还是错了，想不通，为何D不行？请牛牛赐教！
自己顶~~
根据原文，粗略翻译一下：
10年前由于某法的出台，工业污染下降18%，因此觉得是某法的作用。但是同期商家少了10%，工人雇佣也少了12%，然后推是经济的衰退导致污染下降而不是某法。
也就是想说，是因为倒闭了很多厂家，所以没机会污染啦，并不是不想污染di...
然后C就有力驳斥它：不对！倒闭的那些厂家里面只有5%是有搞污染，推出：如果不是大家怕了那法，肯定还继续污染。证明还是某法厉害
而D呢，那些大公司撤出这里某种原因是为了避开那个变态法。
请问D如何削弱呢，它们为了避开那个法走了，如果因此导致污染下降了，这不就法的威力么，是加强吧孩子？
根据原文，粗略翻译一下：
10年前由于某法的出台，工业污染下降18%，因此觉得是某法的作用。但是同期商家少了10%，工人雇佣也少了12%，然后推是经济的衰退导致污染下降而不是某法。
也就是想说，是因为倒闭了很多厂家，所以没机会污染啦，并不是不想污染di...
然后C就有力驳斥它：不对！倒闭的那些厂家里面只有5%是有搞污染，推出：如果不是大家怕了那法，肯定还继续污染。证明还是某法厉害
而D呢，那些大公司撤出这里某种原因是为了避开那个变态法。
请问D如何削弱呢，它们为了避开那个法走了，如果因此导致污染下降了，这不就法的威力么，是加强吧孩子？
不大明白也@@
削弱的思路就是找“某法的作用大于经济衰退”的选项：
D说明大公司离开本地是因为那个法令，不就是说明某法的作用大于经济衰退吗？
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