C is assertion about such matters(Sharon herself takes no position whatsoever on what the actual facts concerning unemployment statics and concerning people's reports are.)
B.The current level of unemployment is not moderate,文中没说当前的失业率怎样
C.If at least 5% of workers are unemployed, the result of questioning a representative group of people cannot be the percentage Roland cites.并不是质疑R引用的数据
D.It is unlikely that the people whose statements Roland cites are giving accurate reports. 跟C一样,不是对R引用数据准确性的质疑
E .If an unemployment figure is given as a certain percent, the actual percentage of those without jobs is even higher.