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

How to remove static electricity 
Use a humidifier. 
Static electricity is more active when the air is dry, especially in the winter months when people heat their houses, further reducing humidity in the air. Increase the humidity in your house and workplace by using a humidifier.

Pick your answer from:
[1]. Doing so will help reduce the amount of static electricity released into the air. Turn on some cool, soothing music, such as classical or jazz.
[2]. The moisture in the air can help reduce static charge from building up. Having plants around the house or workplace can help increase humidity as well.
[3]. This will suck in most of the moisture and lead to evaporation, while also increasing the cooling of the air. Although this isn't necessary for all situations, it can help as air could react with static electricity instead of allowing more cooling to occur.
[4]. Either fill your cup or bowl with cool water, and place the humidifier over the ceiling vent at your workplace, if you have access to one. Use your dryer's spray nozzle.
The answer is:
[2].