Discussion
Which material change did ethanol blends require in fuel systems?
Answer: B
Older materials swell or corrode in alcohol blends. The last option explains exactly which components are affected, which makes it a correct and more detailed version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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