Shelter-in-place should be used when

• A. It is unsafe to leave the facility
• B. There is a danger outside but it is safe inside
• C. Evacuation is the preferred option
• D. The weather is mild

Answer: (A)

Shelter-in-place is used when staying indoors offers protection from a hazard outside that makes leaving unsafe. The statement that it is unsafe to leave the facility directly captures this trigger: the risk is outside, so you remain inside and secure the environment, rather than moving through the hazard to evacuate. In practice, you would close doors and windows, turn off or adjust ventilation as advised, listen for official instructions, and stay in a safe interior room until officials declare it safe to exit. The idea that there is danger outside but safety inside also describes a shelter-in-place scenario, but the key point is the inability to safely leave. Weather being mild doesn’t require shelter-in-place, since there’s no external hazard driving the need to stay indoors. Evacuation is what you follow if authorities indicate it’s safer to leave or if conditions outside are preferable to remaining inside, which is the opposite situation.