单项选择题

在窗体上添加一个命令按钮(其Name属性为Command1),然后编写如下代码:
Option Base 1
Private Sub Command1_Click()
Dim a
s = 0
a = Array(4, 3, 2, 1)
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,其输出结果是

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