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(D) $[6]-$Annulene (benzene) is aromatic as it is planar,cyclic,and has $6\pi$ electrons ($4n+2$ rule,$n=1$).$[8]-$Annulene is non-aromatic because it

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$A$ is not correct but $R$ is correct.

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(D) $[6]-$Annulene (benzene) is aromatic as it is planar,cyclic,and has $6\pi$ electrons ($4n+2$ rule,$n=1$).$[8]-$Annulene is non-aromatic because it is non-planar (tub-shaped) to avoid angle strain,despite having $8\pi$ electrons ($4n$ rule).Cis$-10-$Annulene is non-aromatic because the internal hydrogen atoms at positions $1$ and $6$ experience steric hindrance,forcing the molecule out of planarity,which prevents continuous conjugation.Thus,Assertion $A$ is incorrect because it labels cis$-10-$Annulene as aromatic.Reason $R$ is correct because planarity is indeed a fundamental requirement for a molecule to be aromatic ($H$ückel's rule).Therefore,$A$ is not correct but $R$ is correct.

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