In addition to the support function for the head and neck, which contributes to reducing tension in the cervical area of the spine, headrests play an essential role in preventing serious cervical spine injuries, from the perspective of preventive driving. In the event of a rear‑end impact, they prevent the sudden backward movement of the head (due to inertia), thus protecting the cervical spine and reducing the risk of fractures.
The correct answer is: A
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