Which option describes a purifier most accurately?

• A. A device that removes dirt or harmful substances
• B. A device that purifies water
• C. A device that stores purified water
• D. A device that measures air quality

Answer: (A)

Purification means removing contaminants to make something safer or cleaner. A purifier is a device that removes dirt or harmful substances from air, water, or surfaces, reducing exposure to hazards. That broad description captures the essence of what purification aims to do. The other ideas are narrower or different: a device that purifies water is a specific type of purifier, but it doesn’t cover purifying other substances; storing purified water isn’t about cleansing it; measuring air quality is about assessing cleanliness, not removing contaminants. So the description that best fits a purifier overall is a device that removes dirt or harmful substances.