NO.PZ2021071301000018
问题如下：
Which of the following is likely to account for the decline in labor force participation and unemployment
选项：
A.The number of voluntarily unemployed fall.
B.The number of underemployed workers rise.
C.
The number of discouraged workers rise.
解释：
C is correct.
Statistics show that discouraged workers are not part of the workforce. As a result, an increase in discouraged workers would reduce the labor force and thus the labor force participation rate. So the ratio of the labor force to the total working age population increases. Moreover, a rise in discouraged workers would lower the unemployment rate, since discouraged workers are not counted in the official unemployment rate.
灰心丧气的工人放弃了找工作，统计数据显示他们不在劳动力大军之中。因此，这类工人的增加会降低劳动力，从而降低劳动参与率，即劳动力与总劳动年龄人口的比率下降。此外，此类工人的增加将降低失业率，因为它们不计入官方失业率。
请问为什么不选B呢？
