单项选择题

有如下程序段:Private Sub Command1_Click( ) Dim a As Integer a=2 For i=1 To 3   Print G(a) Next iEnd SubFunction G(a As Integer) b=0 Static c b=b + 1 c=c + 1 G=a + b + cEnd Function运行上面的程序后,单击命令按钮,输出结果为

A.1 2 3
B.2 3 4
C.4 5 6
D.1 4 6