设已经在“菜单编辑器”中设计了窗体的快捷菜单，其顶级菜单为Bs，取消其“可见”属性，运行时，在以下事件过程中，可以使快捷菜单响应鼠标右键菜单的是

A．Private Sub Form_MouseDown(Button As Integer，Shift As Integer，
X As Single，Y As Single)
If Button=2 Then PopupMenu Bs，2
End Sub
B．Private Sub Form_Mouse Down(Button As Integer，Shift As Integer，
X As Single，Y As Single)
PopupMenu Bs
End Sub
C．Private Sub Form_MouseDown(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
PopupMenu Bs，0
End Sub
D．Private Sub Form_MouseDown(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
If(Button=VbLeftBuaon)Or(Button=VbRighButton)Then PopupMenu Bs
End Sub