单选题Which factor has the greatest impact on the estimated per unit labor cost for a project？（）AHistorical informationBUse of outside vendorsCChange control processesDHuman resource skill level requirements
单选题
Which factor has the greatest impact on the estimated per unit labor cost for a project？（）
A
Historical information
B
Use of outside vendors
C
Change control processes
D
Human resource skill level requirements
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