The four connectivity sketches show idealised isolated species. Equivalent terminal bonds are related by symmetry or resonance. Which species contains THREE chemically distinct bond-length families, when O–H bonds are excluded and bonds are grouped by both connected elements and local environment?

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I, CO₃²⁻, has one C–O family. II, H₂PO₄⁻, has two P–O families in the simple resonance model: two equivalent nonprotonated bonds and two equivalent P–OH bonds. III, C₂O₆²⁻, has resonance-equivalent terminal C–O bonds, the C–O bonds attached to the peroxide chain, and the O–O bond: three families. IV, SO₄²⁻, has one equivalent S–O family. The exclusion of O–H removes an otherwise additional family.

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