Discussion
Which device limits the force the belt applies to the chest?
Answer: C
A torsion bar twists above a set load so the belt gives progressively rather than breaking ribs. The last option describes exactly that mechanism, which makes it a correct and more detailed version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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