The correct answer is: A. Is there a video cursor or action on the screen?
A video cursor or action on the screen is the most obvious sign that the display is working. If there is no video cursor or action on the screen, then the display is likely not working.
The other options are not as reliable indicators of whether the display is working. For example, a computer may beep or chime even if the display is not working. High voltage static on the screen is also not a reliable indicator of whether the display is working, as it can be caused by a number of different things, including a loose connection or a faulty power supply.
Therefore, the best way to determine if the display is working is to check for a video cursor or action on the screen. If there is no video cursor or action on the screen, then the display is likely not working.