Which of the following is crucial for fire safety when dealing with partially burned materials?

Using a metal container is crucial for fire safety when dealing with partially burned materials because it helps to safely contain any smoldering or burning debris, preventing the spread of fire. Metal containers are non-combustible and can resist high temperatures, making them a suitable choice for holding materials that may still be hot or releasing embers. This containment minimizes the risk of igniting any nearby flammable materials and assists in controlling the situation until proper disposal or further action can be taken.

Additionally, using a metal container can facilitate safe transportation of the materials without the risk of fire spreading during movement. It also ensures that any potentially hazardous materials are kept secured, reducing the likelihood of accidents or flare-ups.

While bright lighting, water sources, and proper ventilation are important considerations for fire safety in other contexts, they do not directly address the specific need to contain partially burned materials effectively. Bright lighting improves visibility, which is useful for assessing the scene, while water sources provide a means of extinguishing fires, and proper ventilation aids in fire control by dispersing smoke and heat. However, the immediate concern with partially burned materials is their safe containment, which is best achieved with a metal container.