单项选择题

A.退还已收票价与已乘用区间票价差额,不收手续费
B.退还已收票价与已乘用区间票价差额,核收退票费
C.退还已收票价与已乘用区间票价差额,不收退票费
D.退还已收票价与已乘用区间票价差额,核收手续费