Discussion
Which quantity must be kept below unity to guarantee thermal stability?
Answer: C
Stability requires the thermal loop gain - the product of the electrical and thermal sensitivities - to be less than one, exactly as with any feedback loop. The stability factor is a related but different measure and cannot be below unity anyway. The resistance ratio and the voltage fraction are design choices that influence the loop gain without being it. Reducing a thermal problem to a loop gain criterion is what lets it be checked rather than guessed at.
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