The appropriate possessive adjective to fill in the blank is 'leur' as it indicates ownership by the parents. The sentence translates to 'It is their wardrobe.' Other options do not match the context of expressing possession by multiple people. ;
The correct possessive adjective to fill in the blank is 'leur,' indicating ownership by the parents. The completed sentence is 'C'est la penderie de mes parents; c'est leur penderie,' meaning 'It is their wardrobe.' This correctly describes the possession belonging to multiple individuals—here, the parents.
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