Discussion
Which effect does using a lower octane fuel than specified have?
Answer: A
Modern engines protect themselves by retarding, at the cost of power and economy. On an engine without a knock sensor the damage would indeed be real, which makes the second option true of an older vehicle. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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