单项选择题

在窗体上画一个名称为Text1的文本框和一个名称为Command1的命令按钮，然后编写如下事件过程：
Option Base 1
Private Sub Command1_Click( )
Dim s As Integer
Dim aa(3, 2) As Integer
For i = 1 To 3
For j = 1 To 2
aa(i, j) = i + j
Next j
Next i
s = aa(1, 2) + aa(2, 1)
Print s
End Sub
程序运行后，单击命令按钮，窗体上显示的值是( )
A. 4
B. 5
C.6
D. 7