Discussion
Which device removes slack from a seat belt during an impact?
Answer: B
A gas generator drives a piston or rotates the reel, pulling the belt tight before the occupant moves. The last option describes exactly that, which makes it a correct and more detailed version. The inertia reel locks but removes no slack. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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