Discussion
Which component stores that vapour?
Answer: D
Activated carbon adsorbs the vapour and releases it when purge air is drawn through. The last option describes exactly that mechanism, which makes it a correct and more detailed version of the same answer. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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