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.

Column-$I$	Column-$II$
$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)$$2$-butanol,$(-)$$2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

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