单项选择题

在窗体上画一个命令按钮,其名称为Command1,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a=Array(1,2,3,4) j=1 For i=4 To 1 Step -1 s = s + a(i)* j j = j * 10 Next i Print s End Sub 运行上面的程序,单击命令按钮,其输出的结果为

A.4321
B.12
C.34
D.1234