问题详情

Thecost-volume-profit(C-V-P)analysiscanbeusedinmakingdecisionsabout______andsoon.
A．sellingprices
B．productionvolume
C．levelsofdiscretionaryfixedcosts
D．allthethreeabove

请帮忙给出正确答案和分析，谢谢！