Which of the following is aromatic?

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(D) For a compound to be aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and have a continuous cyclic conjugation.$(A)$ Cyc

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Cycloheptatrienyl cation

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(D) For a compound to be aromatic,it must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and have a continuous cyclic conjugation.$(A)$ Cyclopentadienyl cation has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$(B)$ Cyclobutadiene has $4$ $\pi$ electrons ($4n$ system),so it is anti-aromatic.$(C)$ Cycloheptatriene is non-planar due to the $sp^3$ hybridized carbon atom,so it is non-aromatic.$(D)$ Cycloheptatrienyl cation (tropylium ion) has $6$ $\pi$ electrons ($4n+2$ where $n=1$),is planar,and fully conjugated,making it aromatic.

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