Discussion
Which valve does such a sealed system require at refuelling?
Answer: A
The pressure must be released to the canister before the flap will unlock. The last option describes exactly that sequence, which makes it a correct and more detailed version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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