Which of the following best represents safety practices for gas cylinder storage?

Storing gas cylinders in well-ventilated areas is essential for safety because it helps prevent the accumulation of gases that could become hazardous if leaked. Proper ventilation reduces the risk of explosive concentrations of flammable gases or oxygen-deficient atmospheres that could lead to fires or suffocation. By ensuring that gas cylinders have adequate airflow, the chances of a dangerous incident occurring are significantly minimized.

On the other hand, stacking cylinders can create instability, increasing the risk of them falling and causing leaks or ruptures. Keeping cylinders near heat sources could lead to increased pressure within the cylinders, potentially causing them to explode. Leaving gas cylinders unmonitored can result in a lack of awareness regarding leaks or other dangerous conditions that may arise, putting safety at risk. Therefore, ensuring that cylinders are stored in well-ventilated areas is the most effective safety practice among the options provided.