Discussion
An engine cranks very slowly, the battery tests as fully charged and sound, and the earth strap becomes hot during the attempt.
Which conclusion follows?
Answer: B
Heat at the strap is direct evidence of resistance there, wasting the voltage the motor needs. A shorted motor would draw excessive current everywhere rather than heating one connection. Voltage drop measurement confirms it in seconds. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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