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

How to prime a keurig coffee maker 
Remove the reservoir. 
You may be getting a " prime " error on your machine due to a dirty water reservoir. Take the lid off of the water reservoir, and remove the water reservoir from your machine.

OPTIONS:
I. Set the reservoir aside after you get on the machine. Figure out which way the opening of the water reservoir is located..
II. Run a line of water through the piston pulley to remove the old reservoir from the unit. Be careful handling your keurig..
III. Before you clean your water reservoir, try re-seating it. It is possible that your reservoir is out of alignment..
IV. Remove the tank lid on your machine after you've drained it. Place the lid back on the tank lid, and shut the lid back into its holes, then set your keurig machine on a flat, uncharged surface..
The answer is:
III.