费费逻辑79引起的困惑 --- 误把“支持”当“假设”

各位NN，

    小弟在做79题时， 看到选项A， 觉得A可以支持结论， 所以没往下看， 就选了A， 看答案后发现A错， 重做时， 看到C， D 感觉也对， 当然看到E后， 觉得肯定是E， 就突然产生了困惑， 好象“假设”和 “支持” 选项都可要导出结论， 很容易迷惑。 肯请NN们解答， 有什么很简洁的方法区别这两种选项。

79. Which one of the following is an assumption on which the argument depends?

A.        Urban pollution has not doubled in the past decade. (加强)

B.        Doctors and patients generally ignore the role of allergies in asthma.

C.        Bronchial inhalers are unsafe, even when used according to the recommended instructions.  (我觉得也是加强， 答案说是 无关或 削弱？？？)

D.       The use of bronchial inhalers aggravates other diseases that frequently occur among asthma sufferers and that often lead to fatal outcomes even when the asthma itself does not.

(加强， 和C是一样的， C怎可能无关或 削弱)

E.        Increased urban pollution, improved recording of asthma deaths, and the used of asthma deaths, and the use of bronchial inhalers are the only possible explanations of the increased death rate due to asthma.

Answer: E