Discussion
Which effect does a rich mixture have on the required firing voltage?
Answer: C
A richer mixture breaks down at a lower voltage than a lean one, which is why lean running makes misfires more likely. That relationship is one reason lean burn engines need particularly capable ignition systems. Naming what changes and what stays the same is the reliable route through questions of this shape. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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