—Which one do you want to buy, an ipod touch 4, an ipad 3 or an iphone 5 ?—. They are too

—Which one do you want to buy, an ipod touch 4, an ipad 3 or an iphone 5 ?
— . They are too expensive.
A. All
B. Both
C. None
D. Neither

A. All B. Both (答案→)C. NoneD. Neither解析：考查不定代词的用法。all意为“都；全部”，强调三者或者三者以上的人或事物；both意为“两者都……”；none意为“三者或三者以上都不”neither意为“两者都不”。句意为“你想买哪一件？”选择对象是三个，回答为“它们太贵”。故选C。

我好好复习下