Which action is part of the earthquake safety procedure?

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The action shown is best because the goal during shaking is to protect your body from falling debris by getting low and using a nearby sturdy surface for support. Dropping to the floor and covering your head is important, ideally with something solid to shelter under, but if that isn’t available, moving close to a stable interior wall provides a protective barrier and a place to brace yourself as the ground shakes. Standing in a doorway is not reliable protection and can still expose you to flying debris or a swinging door. Evacuating via exterior stairs during shaking is dangerous since stairs can be crowded, blocked, or collapse, making evacuation hazardous. So, moving against an interior wall aligns with seeking shelter and bracing yourself near a solid structure, which helps reduce injury during the quake.