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

How to clean a sink drain
Remove your drain cover.
Remove any covers that are on top of your drain. If you have a pop-up drain stopper, turn the cover counter-clockwise to remove it from the drain.

Choose from: [+] Put on your rubber boots (if you have them). This will help your fingers to get under the drain covers.. [+] Place a towel over the drain to catch the water as you remove the top cover. Start by emptying the top of the drain.. [+] If you have a colander, turn the cover counter-clockwise to take the tray off. Remove the screw securing the cap and filling tray.. [+] Eliminate any excess food that's left over from washing dishes or hair that's built up near the top of the drain. Empty out of the sink before you start cleaning the drain..
The answer is:
Eliminate any excess food that's left over from washing dishes or hair that's built up near the top of the drain. Empty out of the sink before you start cleaning the drain.