6. Recent audits revealed that BanqueCard, a credit service, has erred in calculating the interest it charges its clients. But BanqueCard’s chief accountant reasoned that the profits that the company shows would remain unaffected by a revision of its clients’ credit statements to correct its previous billing errors, since just as many clients had been overcharged as undercharged. Which of the following is a reasoning error that the accountant makes in concluding that correcting its clients’ statements would leave BanqueCard’s profits unaffected?
(A) Relying on the reputation of BanqueCard as a trustworthy credit service to maintain the company’s clientele after the error becomes widely known
(B) Failing to establish that BanqueCard charges the same rates of interest for all of its clients(My choice)
(C) Overlooking the possibility that the amount by which BanqueCard’s clients had been overcharged might be greater than the amount by which they had been undercharged
(D) Assuming that the clients who had been overcharged by BanqueCard had not noticed the error in their credit bills
(E) Presupposing that each one of BanqueCard’s clients had either been overcharged or else had been undercharged by the billing errorundercharged
为何 C 是正确的呢？在原文中作者明明已经提到了overcharged和undercharged的人数是一样多的，他并不是没有考虑人数不同的可能性，而是将它作为一个理由告诉我们。而对于B来讲，就是由于针对作者所说到的：两者的数目相同的问题进行了反驳，那就是虽然量上相同，但是rates尚有差距，那么就达不到statement balance了。
还请各位指教，谢谢了！！
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