求助一道语法题，大牛请赐教

费心费解

105.(30121-!-item-!-188;#058&004107)

Even though it was not illegal for the bank to share its customers' personal and financial information with an outside marketing company in return for a commission on sales, the state's attorney general accused the bank of engaging in deceptive business practices by failing to honor its promise to its customers to keep records private.

(A) by failing to honor its promise to its customers to keep

(B) by its failure of honoring its promise to its customers to keep

(C) in its failing to honor its promise to its customers of keeping

(D) because of its failure in honoring its promise to its customers in keeping

(E) because of its failure to honor its promise to its customers of keeping
我选的是B，答案是A，语法笔记解释是动词比名词更简洁有效，但是XDF老师说有效性是N》V>ADJ.应该怎么解释啊？牛牛赐教啊~~~~~

yexuu

让我选我肯定是选A的，首先，简洁，这是没有疑问的，而且noun+of+doing很多时候都是wordy的，其次，从具体的表达上看，动词显得更直接，而用名词，则会显得有点间断，似乎可以把它分成两个句子，后半句用来修饰failure，总体来说我觉得两种方式的侧重点不同。个人意见，仅供参考

sunnymu57

lz笔记记错了，新东方老师讲得是v>adj>抽象n>动n.
A显然比B好，failing这里是v.的现在分词形式，不是动n.,注意区分下哦！