Final answer:
The correct translation of 'This is my daughter' in French is 'C'est ma fille.'
Step-by-step explanation:
The correct translation of the sentence 'This is my daughter' into French is 'C'est ma fille.'
'C'est mon fille' is incorrect because 'mon' is used for masculine nouns, whereas 'fille' is feminine. 'C'est ma femme' means 'This is my wife' and 'C'est mes fille' means 'These are my daughters.'
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