Discussion
Which emission source releases fuel vapour from the tank?
Answer: C
Diurnal temperature change and refuelling both drive vapour from the tank. The last option describes exactly those mechanisms, 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. Naming what changes and what stays the same is the reliable route through questions of this shape. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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