Discussion
Which tank feature accommodates vapour expansion?
Answer: A
The tank is never filled completely, leaving room for expansion. The last option explains exactly that provision, which makes it a correct and more detailed version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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