Discussion
Which noise indicates a failing alternator bearing?
Answer: B
Worn bearings rumble and the noise follows engine speed rather than load. Electrical whine that varies with load is a genuine alternator noise from the stator, which makes the last option a real but different symptom. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. 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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