Which structure is most stable?

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(C) The stability of the keto-enol tautomers of acetylacetone is determined by the presence of intramolecular hydrogen bonding. In the enol form where

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(C) The stability of the keto-enol tautomers of acetylacetone is determined by the presence of intramolecular hydrogen bonding. In the enol form where the double bond is internal (option $C$),the structure forms a stable six-membered ring due to intramolecular hydrogen bonding between the hydroxyl group and the carbonyl oxygen. This resonance-stabilized chelate ring makes this specific enol tautomer significantly more stable than the other enol forms or the non-chelated keto form.

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