【名词&注释】
益母草(leonurus japonicus)、牡丹皮(cortex moutan)、生地黄(radix rehmanniae)、样本容量(sample size)、仙鹤草(agrimony)
[单选题]()is the budgeted amount for the work actually completed on the schedule activity or WBS component during a given time period.
A. Planned value
B. Earned value
C. Actual cost
D. Cost variance