Which adjustment matters most for head restraint effectiveness?
Answer: A
Too low a restraint acts as a fulcrum and makes injury worse. The last option adds the distance requirement, which makes it a correct and fuller version. A large gap allows the head to accelerate before contact. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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