单项选择题According to the text, one factor that causes unemployment and earnings figures to over-predict the amount of economic hardship is the （）.

A. recurrence of periods of unemployment for a group of low wage workers
B. fact that unemployment counts do not include those who work for low wages
C. establishment of a system of record keeping that makes it possible to compile poverty statistics
D. prevalence, among low wage workers and the unemployed, of members of families in which others are employed

单项选择题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