单项选择题

A.保险费=30000*(0.7%+0.04%)/(1+10%)
B.保险费=30000*(1+0.7%)*(10%+0.04%)
C.保险费=30000*(1+0.04%)*(10%+0.04%)
D.保险费=30000*(1+10%)*(0.7%+0.04%)