单项选择题

A.0.2%NaF,8%~10%SnF2或APF
B.2%NaF,8%~10%SnF2或APF
C.2%NaF,2%~5%SnF2或APF
D.2%NaF,2%~8%SnF2及APF
E.2%NaF,10%~15%SnF2及APF