Which of the following best describes a purpose of drains in a building?

The purpose of drains in a building is primarily to remove unwanted liquids from fixtures. Drains are essential components of a plumbing system, as they facilitate the safe and efficient disposal of wastewater from various sources, such as sinks, toilets, and showers. By directing these liquids away from the living areas, drains help to maintain hygiene and prevent the risk of water damage, mold growth, and unpleasant odors.

When liquid waste is generated, having a reliable drainage system ensures that it can be transported away from occupied spaces and discharged into a sewer system or a septic tank. This is crucial for the overall functionality of a plumbing system and for maintaining a healthy environment within the building.

For effective drainage, it is important that the drains are properly installed, sized, and maintained to handle the volume of wastewater produced. This remains a fundamental aspect of plumbing in any structure, underscoring why this option is the best choice among those provided.