OG-138

Question 138-139 are based on the following：
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。

I still do not understand the explanation for C in OG?  Can anybody help me?

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