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Roland:  The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed.

Sharon:  But a normal, moderate level of unemployment is 5 percent, with 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.

Sharon's argument is structured to lead to which of the following as a conclusion?

(A) The fact that 90% of the people know someone who is unemployed is not an indication that unemployment is abnormally high.

(B) The current level of unemployment is not moderate.

(C) If at least 5% of workers are unemployed, the result of questioning a representative group of people cannot be the percentage Roland cites.

(D) It is unlikely that the people whose statements Roland cites are giving accurate reports.

(E) If an unemployment figure is given as a certain percent, the actual percentage of those without jobs is even higher.
这一题完全没有思路，怎么破？？？不知道R与S的对话之间究竟有什么关系。答案A又是怎么和题目联系起来的？求解释！！！问题中是问S能推出什么Conclusion，那Con与R的关系？R在Con中扮演的角色？