The correct answer is: D. FormClosing
The FormClosing event is triggered when the computer processes the Me.Close() statement. This event gives you a chance to perform any necessary cleanup before the form is closed.
The Close event is triggered when the form is actually closed. This event is too late to perform any cleanup, so it is not typically used.
The Closing event is a deprecated event that was used in older versions of Visual Basic. It is not recommended to use this event in new code.
The FormClosing event is the preferred event to use when you need to perform cleanup before a form is closed.