Firefighters are often asked to speak to school and community groups about the importance of fire safety, particularly fire prevention and detection. Because smoke detectors reduce the risk of dying in a fire by half, firefighters often provide audiences with information on how to install these protective devices in their homes. Specially, they tell them these things: A smoke detector should be placed on each floor of a home. While sleeping people are in particular danger of an emergent fire, and there must be a detector outside each sleeping area. A good site for a detector would be a hallway that runs between living spaces and bedrooms. Because of the dead-air space that might be missed by turbulent hot air bouncing around above a fire, smoke detectors should be installed either on the ceiling at least four inches from the nearest wall, or high on a wall at least four, but no further than twelve inches from the ceiling. Detectors should not be mounted near windows, exterior doors, or other places where drafts might direct the smoke away from the unit. Nor should they be placed in kitchens and garages, where cooking and gas fumes are likely to cause false alarms.
A smoke detector must always be placed
outside all bedrooms in a home.
The correct answer is outside all bedrooms in a home.
Standard fire-safety guidance, which the passage follows, is built around protecting people while they sleep — the time they are least likely to notice a fire on their own. For that reason a smoke detector must be positioned outside every sleeping area, so that smoke reaching any bedroom triggers an alarm that wakes the occupants. Placed this way, the alarm covers all the bedrooms in the home, which is exactly what the correct option states.
The option saying a detector need only be outside at least one of the bedrooms on any level is too weak: leaving some sleeping areas uncovered would let a fire near an unprotected bedroom go unannounced, so "at least one" does not meet the safety requirement.
The option calling for detectors in all hallways is not the rule stated; the guidance is anchored to sleeping areas rather than to every hallway.
The option to place a detector in the kitchen runs against fire-safety advice, because ordinary cooking smoke there causes frequent false alarms; kitchens are a location to avoid, not a required spot.
Hence the answer is: outside all bedrooms in a home.
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