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

How to use aromatherapy for fatigue
Boil water.
This method of using aromatherapy involves dropping a few drops into very hot water and then inhaling the steam, which will be infused with the essential oil.
You don't need to boil a giant pot of water.

[-] Just make sure the water is at a comfortable temperature, and if you let it boil long enough, steam the water for a while. This method should be perfect for adults-even if you're not sure how long you should wait for a cup of tea-or for people with chronic sweating issues.
[-] Rather, you can boil just the right amount of water. This technique can be very effective in treating fatigue and also helps lighten light spectrum skin.
[-] Just boil enough so that you can fill a medium sized bowl about halfway. You want to create enough steam so that you can inhale it.
[-] Just three teaspoons of water can completely calm the body and make you feel relaxed. Aromatherapy should be brewed five to seven times a day.
The answer is:
Just boil enough so that you can fill a medium sized bowl about halfway. You want to create enough steam so that you can inhale it.