Discussion
Why does extending conjugation shift a band to longer wavelength?
Answer: D
Delocalising electrons over more atoms raises the highest occupied orbital and lowers the lowest unoccupied one, so the gap shrinks and a longer wavelength suffices. The absorptivity does rise as well, which is a separate hyperchromic effect. Electron count and scattering are not the mechanism. That colour in organic compounds tracks conjugation length follows directly, and it is why dyes are built around long conjugated chains. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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