题目内容：
The author's purpose in citing those who are repeatedly unemployed during a twelve-month period is most probably to show that______________.
A．there are several factors that cause the payment of low wages to some members of the labor force B．unemployment statistics can underestimate the hardship resulting from joblessness
C．recurrent inadequacies in the labor market can exist and cause hardships for individual workers
D．a majority of those who are jobless at any time does not suffer severe hardship
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