A. is correctly punctuated.
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B. "Do you have the time?" she asked. B would be wrong because it doesn't have a comma.
C. "Do you have the time" she asked? C would be wrong because it doesn't have a question mark and comma in "Do you have the time", it should be "Do you have the time?,"
D. "Do you have the time," she asked? D would be wrong because it has a question mark at the end instead of a period.