问题如下：
Which of the following statement is described as some jobs for which unemployed workers are not qualified
选项：
A. Structural unemployment
B. Cyclical unemployment
C. Frictional unemployment.
解释：
A is correct.
Structural unemployment is defined as some jobs for which unemployed workers are not qualified.
考点：Structural unemployment
解析：本题考察的是结构性失业的定义，它是指由于工人的技能不符合当前工种的需要，所诱发的失业。
C为什么不对，摩擦性不对吗