Discussion
Which property makes methane hard to oxidise catalytically?
Answer: C
The methane molecule is unusually stable and needs a high catalyst temperature. The last option explains exactly that, which makes it a correct and more instructive version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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