求教，OG10TH第66题

66. The Federal Reserve Board's reduction of interest rates on loans to financial institutions is both an acknowledgment of past economic trends and an effort to influence their future direction.

(A) reduction of interest rates on loans to financial institutions is both an acknowledgment of past economic trends and an effort

(B) reduction of interest rates on loans to financial institutions is an acknowledgment both of past economic trends as well as an effort

(C) reduction of interest rates on loans to financial institutions both acknowledge past economic trends and attempt

(D) reducing interest rates on loans to financial institutions is an acknowledgment both of past economic trends and an effort

(E) reducing interest rates on loans to financial institutions both acknowledge past economic trends as well as attempt 

也看了很多讲解，1。但还是不明白为什么用reducing不对呢？

                              2。在确定reduction正确后，是只通过逻辑排除B.C么？

reduction是名词,所以优于动名词形式了

B与原文有歧义，

C动词不对，不是人做主语