Discussion
How does collector-to-base feedback bias improve stability?
Answer: D
Taking the base resistor from the collector rather than the supply means a rise in collector current lowers the collector voltage and so reduces the base current, opposing the original change. Raising the emitter voltage is the emitter bias mechanism, and a fixed divider is the voltage divider arrangement. It is negative feedback in the bias loop, and the improvement over fixed bias comes entirely from that one changed connection. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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