The labor rate variance is determined by multiplying the difference between the actual labor rate and the standard labor rate by：（）直接人工工资率差异是用实际人工费率与标准人工费率之差乘以：

A.The standard labor hours allowed for a given level of output.给定产出水平所允许的标准工时。

B. The standard labor rate.标准人工费率。

C.The actual hours worked during the period.期间的实际工作时间。

D. The actual labor rate. 实际人工费率。

正确答案：The actual hours worked during the period.期间的实际工作时间。