Discussion
Which advantage does a higher system voltage give?
Answer: D
Power is voltage times current, so doubling the voltage halves the current for the same power and cable size falls accordingly. Reduced current does genuinely reduce fire risk from resistive heating, which makes the last option partly true. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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