大全696 有点疑问

696 The Baldrick Manufacturing Company has for several years followed a policy aimed at decreasing operating costs and improving the efficiency of its distribution system.

(A) aimed at decreasing operating costs and improving
(B) aimed at the decreasing of operating costs and to improve
(C) aiming at the decreasing of operating costs and improving
(D) the aim of which is the decreasing of operating costs and improving（A）
(E) with the aim to decrease operating costs and to improve

答案是A 我没有疑问。

但是旧版OG说 aimed at 是形容词短语 不是动词过去分词。

新版的OG 把这句解释去掉了。没有讨论这个aimed at 到底是什么。

我的问题是 

1：旧版OG解释错了吧？

2：aimed at 和 aiming at 在选项A中互换有问题吗？ 为什么？

没人理我？