(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
原文意思：虽然银行和别人分享个人的金融信息不违法，但是律师仍然指责银行通过一个什么手段（这个手段看不懂）来从事deceptive business。
题目分析：读完原文之后，发现A选项没有逻辑错误，先留着。B用its failure显然没有用failing好，C用in表示在...方面的意思，而原文表示通过什么手段的意思，不能用in，DE都用its failure，没有failing好，选A。
