Discussion
Why is nitrogen sometimes preferred despite its sharp curve?
Answer: C
Run exactly at its optimum, nitrogen delivers the highest efficiency of the three, which suits a difficult separation where time is not pressing. Its low diffusivity is precisely why the optimum is sharp and the analysis slow, and the detector imposes no such requirement. Choosing between a deep narrow minimum and a shallow broad one is a choice between efficiency and speed, and the separation's difficulty decides it. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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