Aromaticity is present in

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(C) To determine aromaticity,a molecule must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons,wh

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Indene

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(C) To determine aromaticity,a molecule must follow $H$ückel's rule: it must be cyclic,planar,fully conjugated,and contain $(4n + 2) \pi$ electrons,where $n$ is an integer $(n = 0, 1, 2, ...)$.$A$. Cyclopropenyl anion: It has $4 \pi$ electrons ($2$ from the double bond and $2$ from the lone pair on the carbon atom). This follows $4n$ rule,making it anti-aromatic.$B$. Pyrrole cation: The nitrogen atom is $sp^2$ hybridized. The $\pi$ system consists of $4$ electrons from the two double bonds. Total $\pi$ electrons = $4$. This is anti-aromatic.$C$. Indene: It is a bicyclic compound consisting of a benzene ring fused to a cyclopentadiene ring. The benzene part is aromatic,and the overall molecule exhibits aromatic character due to the $6 \pi$ electron system in the benzene ring.$D$. Cyclooctatetraene: It has $8 \pi$ electrons. It is non-planar (tub-shaped) to avoid anti-aromaticity,hence it is non-aromatic.Therefore,aromaticity is present in Indene.

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