以前有几项研究表明，吃巧克力会增加使用者换心脏病的可能性。而一项最新的更为可靠的研究得出的结论为：吃巧克力与心脏病发病率无关。估计这项研究成果公布之后，巧克力的消费量会大大增加。上述推论基于以下哪项假设？
【专题 GMAT逻辑题】
Which of the following mostlogically complete the passage?
A recent government study links the highrates of respiratory ailment in Groverston to airborne pollutants released bythe Woodco plywood manufacturing plant there. To address the problem, thegovernment imposed strict regulations on emissions which will go into effect infour years. Although Woodco plans to cut its emissions in half two years aheadof schedule, it is unlikely that the rate of respiratory ailments will declinebefore the regulations go into effect, since .
(A) the number of facilities capable oftreating respiratory ailments is not likely to increase
(B) reducing emissions even further thanplanned would necessitate decreasing production at Woodco
(C) it is difficult to make accurate,long-term predictions about emissions
(D) not all respiratory ailments are causedby airborne pollutants
(E) three new plywood manufacturing plantsare about to go into production in Groverston
有一个牢房，有3个犯人关在其中。因为玻璃很厚，所以3个人只能互相看见，不能听到对方说话的声音。”
有一天，国王想了一个办法，给他们每个人头上都戴了一顶帽子，只叫他们知道帽子的颜色不是白的就是黑的，不叫他们知道自己所戴帽子的是什么颜色的。在这种情况下，国王宣布两条如下：
1．谁能看到其他两个犯人戴的都是白帽子，就可以释放谁；
2．谁知道自己戴的是黑帽子，就释放谁。
其实，国王给他们戴的都是黑帽子。他们因为被绑，看不见自己罢了。于是他们3个人互相盯着不说话。可是不久，心眼灵的A用推理的方法，认定自己戴的是黑帽子。您想，他是怎样推断的?
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