For several years, per capita expenditure on prescription drugs in Voronia rose by fifteen percent or more annually. In order to curb these dramatic increases, the ministry of health prohibited drug manufacturers from raising any of their products' prices. Even though use of prescription drugs did not expand after this price freeze, per capita expenditure for prescription drugs continued to increase by a substantial percentage each year.
Which of the following, if true, most helps to explain why the ministry's action did not achieve its goal?
To：阻止处方药的花费上升 Plan：禁止药商抬价 结果：药价没有上升，但是平均消费还是上升了 问原因 A 价格上涨被禁止后，药商关注新药代替现在药品，新药不受限制直接卖高价，导致处方药花费上升，削弱计划目标，正确 B 讨论人口，无关 C 即使限价，也有利润，无关 D 除了限制药价，还鼓励开便宜的药，解释反了 E 限价后，国外的制药商如何，无关