单项选择题

A.净现金流量=销售收入-经营成本-销售税金及附加
B.净现金流量=销售收入-总成本-销售税金及附加
C.净现金流量=销售收入-经营成本-销售税金及附加-所得税
D.净现金流量=销售收入-总成本-销售税金及附加-所得税