The correct answer is B. Dehumidifying air in buildings
Explanation:
One of the factors that can cause respiratory problems such as asthma, bronchitis or lung cancer is the exposition to chemicals or nocive substances, this includes mildew, smoke, pollen, bacteria, fungi, etc. In the case of mildew and allergens such as dust mites, these can be avoided by using a dehumidifier, which is an appliance to regulates the humidity in the air; this is useful because it prevents mold or mildew from developing and reduces or eliminates dust mites. Due to this, you could dehumidify air in buildings to prevent respiratory problems as a dehumidifier reduces substance that can cause respiratory diseases.
