Discussion
Which restraint system deploys within milliseconds of an impact?
Answer: A
An airbag inflates within about thirty milliseconds of the impact being recognised. The last option adds the pretensioner, which fires at the same moment, making it a correct and fuller version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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