Function F(a As Integer) Dim b As Integer Static c As Integer b = b + 2 c = c + 3 F = a + b + c End Function Private Sub Command1_Click() Dim a As Integer a = 4 For i = 1 To 3 Print F(a); Next i End Sub 程序运行后,单击窗体,在窗体上显示的值是( )。 A、9 9 9 B、9 12 15 C、9 14 19 D、9 11 13