Discussion
Which effect does low temperature have on a lead acid battery?
Answer: C
Chemical activity slows in the cold so the battery delivers less, while thick oil makes the engine harder to turn. The two effects compound rather than cancel. That is why batteries fail on the first cold morning. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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