—What can I do for you ?—I want MP4 player for my daughter. She needs .A. a, oneB. an, one

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A. a, one
(答案→)B. an, one
C. the, it
D. an, this
解析：此题考查不定冠词的基本用法。不定冠词有a和an两种：a用于辅音音素开头的词前，an用于元音音素开头的词前。One作为体代词，代替前文所提到的那类事物。