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 should not be installed near a window because
A draft may pull smoke away from the detector.
The correct answer is a draft may pull smoke away from the detector.
The reasoning here is about airflow. The passage advises against placing a smoke detector near a window because a draft (a current of moving air) coming through the window can carry smoke away from the detector before enough smoke gathers around it to set off the alarm. If the smoke is swept aside, the alarm may sound late or not at all — which defeats the detector's purpose. This cause-and-effect matches the correct option exactly.
The option about outside fumes triggering a false alarm is not the reason the passage gives for avoiding window placement.
The option about a draft creating dead-air space reverses the actual mechanism: the passage links drafts to smoke being diverted, whereas dead-air space is a separate idea used to explain why detectors should not be tucked into corners, not why they should be kept from windows.
The option about outside noise muffling the alarm is never mentioned as a reason at all.
Hence the answer is: a draft may pull smoke away from the detector.
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