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_MouseDown(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=vbLeftButton)Or(Button=vbRightButton)Then PopupMenu Bs End Sub