单项选择题

在窗体上画一个命令按钮,其名称为Commandl,然后编写如下事件过程: Private Sub Commandl_Click() Dim al(4,4),a2(4,4) Dim i As Integer,j As Integer For i=1 To 4 For j=1 To 4 a1(i,j)=i+j a2(i,j)=a1(i,j)+i+j Next j Next i Print al(3,3);a2(3,3) End Sub 程序运行后,单击命令按钮,在窗体上输出的是______。

A.6 6
B.10 5
C.7 21
D.6 12