一句话不大理解，帮忙看看！

R：The alarming fact is that 90 percent of the people in this country now report that they know some one who is unemployed。

S：But a normal， moderate level of unemployment is 5 percent， which 1 out of 20 workers unemployed。 So at any given time if a person knows approximately 50 workers， 1 or more will very likely be unemployed。

138。 Sharon‘s argument is structured to lead to which of the following as a conclusion？
A。 The fact that 90 percent of the people know someone who is umemployed is not an indication that unemployement is abnormally high。
B。 The current level of unemployment is not moderate。
C。 If at least 5 persent of workers are unemployed， the result of questioning a representative group of people cannot be the percentage R cites。
D。 It is unlikely that the people whose statements R cites are giving accurate reports。
E。 If an umemployment figure is given as a certain percent， the actual percentage of those without jobs is even higher。

红色的这句话不是很理解，请大家帮忙看看，请大家帮忙看看选项c表达了怎样一个意思？

谢谢

我也觉得是a

麻烦给题源和答案

谢谢tomorrowneverdie 对于这道题，我倒不是对答案有什么疑惑！这是og上的一道题，我也做过两边了，只是近日看og解释的时候突然发现对答案c表达的意思不是很明确！

to lawyer-1，谢谢你的翻译，不过我还是不明白这句话到底表达了一个什么样的意思，什么叫 can not be the percentage R cites 呀？可能是我脑子转不过来弯，始终不太清楚

还有这里为什么要说representative group呢？这个representative group指德是什么意思，是不是说这样一个question 这样一个group的结果比较有代表性？