为了保持一定的库存，要付出保管费；为了补充库存，要付出订货费；当储存不足发生缺货时，要付出缺货损失费。这三项费用之间是相互联系的。( )

A new laptop costs about _____ of a second-hand one.

A．the price of three times

B．three times the price

C．as much as the three times price

D．three times more than the price