59. Which of the following most logically completes the passage?
A recent government study links the high rates of respiratory ailments in Groverston to airborne pollutants
released by the Woodco plywood manufacturing plant there. To address the problem, the government imposed
strict regulations on emissions which will go into effect in four years. Although Woodco plans to cut its
emissions in half two years ahead of schedule, it is unlikely that the rate of respiratory ailments will decline
before the regulations go into effect, since.
(A) the number of facilities capable of treating respiratory ailments is not likely to increase
(B) reducing emissions even further than planned would necessitate decreasing production at Woodco
(C) it is difficult to make accurate, long-term predictions about emissions
(D) not all respiratory ailments are caused by airborne pollutants
(E) three new plywood manufacturing plants are about to go into production in Groverston
这个题目有人说是相关因果，污染导致发病，污染减少发病减少；有人说因果；有人说果因。
我自己感觉是因果模式推理，简单归纳一下逻辑链，前提是：政府调查发现发病是由污染导致的，结论是：工厂将减排以减低发病率，题目要求削弱结论。
我自己错选了D，not all respiratory ailments are caused by airborne pollutants，我想有其他原因导致发病，减排了其他原因不变化一样会导致发病，是一种削弱。
后来看了答案解释，自己就纠结了...