Discussion
Why does leakage current matter more in a hot rectifier?
Answer: D
Reverse saturation current roughly doubles for every ten degrees, so a device that leaks microamps at room temperature can leak milliamps when hot - and since that leakage dissipates power under reverse voltage, it can feed a thermal runaway. It does not reverse direction, remains largely independent of reverse voltage, and stays far below the forward current. Any mechanism whose effect grows with the temperature it produces has to be checked for runaway rather than merely tabulated.
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