VERBAL REVIEW-NO.4

Verval Review上第四题我不是很清楚,请大家帮忙看看:

The price the government pays for standard weapons purchased from military contractors is determined by a pricing method called "historical costing". Historical costing allows contractors to protect their profits by adding a percentage increase, based on the current rate of inflation, to the previous year's contractual price.

Which of the following statements, if true, is the best basis for a criticism of historical costing as an economically sound pricing method for military contracts?

A.The government might continue to pay for past inefficient use of funds.

B. The rate of inflation has varied considerably over the past twenty years.

这道题选A,我错选了B。我还是不是很明白，怎么理解A选项这句话呢？