题目是这样的：
15. A researcher studying drug addicts found that, on average, they tend to manipulate other people a great deal more than nonaddicts do. The researcher concluded that people who frequently manipulate other people are likely to become addicts.
Which of following, if ture, most seriously weakens the researcher's conclusion?
(a) After becoming addicted to drugs, drug addicts learn to manipulate other people as a way of obtaining drugs.
(b) When they are imprisoned, drug addicts often use their ability to manipulate other people to obtain better living conditions.
(c) Some nonaddicts manipulate other people more than some addicts do.
(d)People who are likely to become addicts exhibit unusual behavior patterns other than frequent manipulation of other people.
(e) The addicts that the researcher studied were often unsuccessful in obtaining what they wanted when they manipulated other people.
我是这么分析这道题的：
1、题目是：如何削弱结论；
2、所给文章的逻辑结构是：
文章前提部分：
因为 addicts比起nonaddicts更多的manipulate other people
所以 由谁是addicts 那就可以可以推出 他们会manipulate other people
文章结论部分：
由前提，研究者得到结论：谁manipulate other people就可以推出他们可能变成addicts
结论本身也是一个推理过程，要削弱这个结论，可以采取如下的方法：
1、如果可以说明：成为了addicts后，出于某种目的要才会manipulate other people；这是一种削弱。
2、如果可以说明nonaddicts也会manipulate other people，那么显然manipulate other people就成为了addicts与
nonaddicts的共同特征，于是我们就不能得出结论：谁manipulate other people就可以推出谁会是addicts（因为这个人也可能是nonaddicts）。
看答案，选项a显然符合削弱方法1，可选。但是选项c（一些nonaddicts比addicts更多的manipulate other people）也符合选项2，似乎也可选。
但是OG的解释C The action of nonaddicts are not rlevant to an argument about addicts,实在让我不知所以。
我是这样看C的：
原题比较的是addicts and nonaddicts
C比较的是 some of the addicts and some of the nonaddicts, 是原题比较对象的真子集
或者可以说C比较的东西和原题比较的东西不是一回事，从范围上来讲很不同，所以无关
如果可以说明nonaddicts也会manipulate other people，那么显然manipulate other people就成为了addicts与
文章没有否认nonaddicts会manipulate other people。只不过addicts更甚而已。所以这点无法反驳文章。
文章只是说，addicts的人更多的会操作别人，所以操纵别人的人可能会变成addicts
谢谢两位的解答，我自己做题时也是用你们这个方法排除C这个选项，但是做完题以后看OG的解释却让我晕了。
The action of nonaddicts are not rlevant to an argument about addicts。
OG的思考角度似乎和我们排除C思考的角度不同。
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