单项选择题

It is impolite not to return telephone calls—regardless of whom they are from（）

A.不管谁的电话都不回，这是不礼貌的。
B.不返还电话是不礼貌的，不管是向谁借的。
C.不回电话是不礼貌的，不管是谁呼的。
D.不回电话是不礼貌的，不管电话是谁打来的。

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