单项选择题

在窗体上画一个命令按钮,其名称为Command1,然后编写如下代码: Option Base 1 Private Sub Command1_Click () Dim a a = Array(1, 2, 3, 4) j = 1 For i = 1 To 4 s = s + a(i) * j j = j * 10 Next i Print s End Sub程序运行后,单击命令按钮,其输出结果是______ 。

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