Which one of the following is most stable?

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(C) The stability of resonance structures is determined by several factors,including the number of covalent bonds,the presence of charge,and the octet

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(C) The stability of resonance structures is determined by several factors,including the number of covalent bonds,the presence of charge,and the octet rule.In the given structures,the structure shown in option $C$ is the most stable.This is because in this structure,every atom (including the nitrogen atom) has a complete octet,whereas in the other structures,the carbon atom with the positive charge has an incomplete octet ($6$ electrons).

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