Discussion
Which conclusion follows from a starter that operates only when tapped?
Answer: A
Tapping frees a sticking plunger or shifts a worn brush into contact. A commutator dead spot produces exactly the same symptom and is a genuine cause, which makes the last option a real alternative rather than a distractor. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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