++++求解OG Vrbal Review 2nd Edition CR 4+++

regards

OG Vrbal Review 2nd Edition CR 4 求解释
4. The price the government pays for standard weapons purchased from military contractors is deternmined by a pricing  method called "historical costing". Historical costing allows contractors to protect their profits by adding a percentage increase, based on tne current rate of inflation, to the previous year's contractual price.
Which of the following satements,if true,is the best basis form 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.
C.The contractual price will be greatly affected by the cost of materials used for the products.
D.Many taxpayers question the amount of money the government spends on military contracts.
E.The pricing method based on  historical costing might not encourage the development of innovative weapons.


弱弱滴问A 里面说什么 inefficient，啥意思啊，看了OG解释也不懂，有没有能给详细解释一下题目的，为什么会出现 inefficient use of funds的 概念？