单项选择题

在窗体上画一个命令按钮，然后编写如下事件过程：
Private Sub Commandl_Click()
Dim m As Integer, n As Integer, p As Integer
m=3: n=5: p=0
Call Y(m, n, p)
Print Str(p)
End Sub
Sub Y(ByVal i As Integer, ByVal j As Integer, k As Integer)
k=i+j
End Sub
程序运行后，如果单击命令按钮，则在窗体上显示的内容是( )