The correct word to complete the sentence is 'ésta.' It is used for feminine singular nouns.
'ésta' is the correct word that completes the sentence.
When referring to a feminine singular noun like 'falda,' 'ésta' is the appropriate demonstrative pronoun to use.
For example, 'Aquella falda es blanca, pero ésta es roja.' means 'That skirt is white, but this one is red.'
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