Which of the following is a safety hazard?

A burned-out light bulb is classified as a safety hazard because it can lead to insufficient lighting in a space, creating an increased risk of accidents such as trips and falls. Proper lighting is essential for visibility, especially in areas where people walk or operate machinery. If the light bulb is in a location that is frequently used, such as stairways or hallways, the lack of illumination can significantly elevate the potential for injury.

While a slow-running sink drain and clogged rain gutters can lead to maintenance issues or water damage over time, they do not present an immediate risk of physical injury. Thus, they are typically not considered direct safety hazards. Choosing the burned-out light bulb as the safety hazard focuses on the impact of adequate lighting on overall safety in any environment.