Discussion
Which precaution reduces the explosion risk when jump starting?
Answer: C
The final connection sparks, so it is made to an engine earth point remote from the vented gases. Connecting last at the flat battery is exactly the wrong thing to do. The sequence exists specifically to keep the spark away from hydrogen. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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