Discussion
Which liquid is used to top up a serviceable battery?
Answer: D
Only the water evaporates or is lost by electrolysis, so water alone is added. Adding acid raises the density beyond the correct figure and damages the plates. Tap water introduces minerals that poison the plates. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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