Which of the following can show resonance?

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(C) Resonance occurs in conjugated systems where $p$-orbitals are parallel and overlapping,allowing for the delocalization of $\pi$-electrons or lone

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$CH_3-CH=CH-CHO$

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(C) Resonance occurs in conjugated systems where $p$-orbitals are parallel and overlapping,allowing for the delocalization of $\pi$-electrons or lone pairs.$A$. $CH_2=CH-CH_2-CH=CH_2$: This is an isolated diene. The two double bonds are separated by an $sp^3$ hybridized carbon atom,so they cannot show resonance.$B$. $CH_2=C(CH_3)_2$: This is an alkene with no conjugation.$C$. $CH_3-CH=CH-CHO$: This molecule has a conjugated system $(C=C-C=O)$. The $\pi$-electrons can delocalize between the carbon-carbon double bond and the carbon-oxygen double bond.$D$. $C_6H_9^+$: This is an allylic carbocation where the positive charge is conjugated with the double bond,allowing for resonance stabilization.Both $C$ and $D$ show resonance. However,in many contexts,the question might be looking for the most prominent example or there might be a typo in the options provided. Given the standard options,both $C$ and $D$ are valid. Assuming a single choice is required,$C$ is a classic example of conjugated carbonyl.

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