Which of the following statements is true regarding emergency fire procedures?

Using a fire extinguisher only if it's safe to do so is a crucial guideline when responding to a fire. This approach emphasizes personal safety as the highest priority. It acknowledges that while it is important to control fires when possible, individuals should not place themselves in harm's way in the process. If the fire is too large, spreading quickly, or if toxic smoke is present, attempting to extinguish the fire may not be advisable.

The decision to use a fire extinguisher should consider the following factors: the type and size of the fire, the availability of a safe exit route, and the person's training in using a fire extinguisher. This aligns with general safety protocols, ensuring that individuals are mindful and responsible in emergency situations, prioritizing evacuation and alerting emergency services if needed.

In contrast, the other statements lack the critical focus on safety or contain misinformation. For instance, trying to extinguish a fire without alerting anyone can lead to dangerous situations, and the idea that fire extinguishers are unnecessary in laboratory settings overlooks their vital role in safety. Finally, suggesting that materials should only be burned outside diminishes the importance of understanding safe fire management practices indoors, including proper containment and extinguishing protocols.