The most stable resonating structure is

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(C) To determine the most stable resonating structure,we follow these rules:$1$. Structures with more covalent bonds are more stable.$2$. Structures w

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(C) To determine the most stable resonating structure,we follow these rules:$1$. Structures with more covalent bonds are more stable.$2$. Structures with complete octets for all atoms are more stable.$3$. Negative charge should reside on the more electronegative atom (like $O$) and positive charge on the less electronegative atom.In the given system,the negative charge can delocalize from the $CH_2^-$ group into the benzene ring and finally onto the oxygen atom of the carbonyl group $(C=O)$.Structure $C$ places the negative charge on the oxygen atom,which is more electronegative than carbon. Additionally,this structure maintains a complete octet for the oxygen atom. Therefore,the structure where the negative charge is on the oxygen atom is the most stable.

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