单项选择题

阅读程序:
Function F(a As Integer)
b=0
Static c
b=b+1
c=c+1
f=a+ b+ c
End Function
Private Sub Command1_Click()
Dim S As Integer
a=2
For i=1 To 3
Print P(

A.
Next i
End Sub
运行上面的程序,单击命令拄钮,输出结果为______ 。A) 4
4
4
B.4
5
6
C.4
6
8
D.4
7
9