Relative stability of contributing structures:

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Step 1: Rules for Resonance Stability
1. Neutral structures are more stable than charged ones.
2. Structures with complete octets are more stable.
3. Negative charge on a more electronegative atom is more stable.

Step 2: Evaluating Structures
- (I) : Neutral, all atoms have complete octets. Most stable.
- (II) : Negative charge on Oxygen (electronegative).
- (III) : Negative charge on Carbon and positive on Oxygen. This is highly unstable as Oxygen is more electronegative than Carbon.

Step 3:

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