This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a box fan
Unplug the box fan.
Wipe down the power cord with a damp cloth. Make sure to dry it.

Pick your answer from: A. Consider shaking the item and then setting it out in the sun to dry faster. Remove the large screws keeping the fan unplugged and leaning against a wall or object. B. It's a good idea to put the fan back in before you put in any laundry or other cleaning. Unplug the old fan if you haven't already. C. Remove the top piece of the fan and examine it. It should be bare metal, not rectangular metal. D. Set the fan itself on a waist level work area, like on a bench or kitchen table. Remove the outer covers of the fan.
The answer is:
D.