Discussion
Which colour of light penetrates fog with least scattering?
Answer: B
Longer wavelengths scatter less, which is why selective yellow fog lamps were once widespread. Red scatters least of all, which makes the last option physically sound but impractical for a forward lamp because red must not show ahead. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape.
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