Enterprise Bank currently requires Customers with checking accounts to maintain a minimum balance or pay a monthly fee. Enterprise plans to offer accounts with no monthly fee and no minimum-balance requirement; to cover their projected administrative costs of $3 per account per month they plan to charge $30 for overdrawing an account. Since each month on average slightly more than 10 percent of Enterprise's customers overdraw their accounts, bank officials predict the new accounts will generate a profit.
Which of the following, if true, most strongly supports the bank officials’ prediction?


Some of Enterprise Bank's current checking account customers are expected to switch to the new accounts once they are offered.

One third of Enterprise Bank's revenues are currently derived from monthly fees tied to checking accounts.

Many checking account customers who occasionally pay a fee for not maintaining a minimum balance in their account generally maintain a balance well above the minimum.

Customers whose checking accounts do not have a minimum-balance requirement are more likely than others to overdraw their checking accounts.

Customers whose checking accounts do not have a minimum-balance requirement are more likely than others to write checks for small amounts.

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情景：银行目前要求客户的checking账户上必须保持一个最小余额，或者交月费。现在推出一款新型账户，没有最小余额和月费的要求，但是会要求账户透支的时候交$30，目的是为了cover此账户的成本。因为每个月会有超过10%的客户透支，所以银行预测自己可以借此盈利。

推理：

（因）前提：每个月有超过10%的客户透支

（果）结论：银行会盈利

选项问的是加强，其实就是选项取非后可以削弱上面的结论（即，银行不会盈利）。

选项分析：

A选项：一旦新账户问世之后，一些银行的现有checking账户的客户期待换成新账户：期待换账户与银行究竟会不会盈利没有关系。


B选项：银行三分之一的收入来自checking账户的月费：收入的构成与会不会盈利无关。

C选项：偶尔因为没有维持最低余额而交钱的客户通常会把余额维持在最小余额之上：和透支带来利润完全没有关系。

D选项：正确。账户没有最小余额限制的客户更容易透支：新型账户的特点便是没有最小余额限制，那此时新型账户的客户更容易透支，就会给银行带来利润。如果取非，“账户没有最小余额限制的客户并不容易透支”，那此时这种新型账户并不会generate a profit。

E选项：账户没有最小余额限制的客户更容易开出小额支票：这与透支带来利润没有关系。

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