Discussion
Which relationship does ignition timing have to engine speed?
Answer: C
Combustion takes roughly the same time whatever the speed, so the spark must occur earlier in crank degrees as speed rises. Load affects timing too but in the opposite sense, which makes the last option describe a real relationship inverted. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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