The correct demonstrative word to use in the phrase is 'Esta' because it is a feminine singular demonstrative that matches the noun 'vestido'. Other options either don't match in gender or are not suitable for the context. Therefore, the complete sentence would be 'Esta vestido es mío.' ;
The correct demonstrative word to use is 'Esta,' meaning 'this' in English, which correctly matches the feminine noun 'vestido.' Therefore, the full sentence is 'Esta vestido es mío,' meaning 'This dress is mine.'
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