Final answer:
In the sentence 'Tú __(1)__ el teléfono', the correct word is 'has roto' as it matches the subject 'tú'.
Step-by-step explanation:
In the sentence 'Tú __(1)__ el teléfono', the correct word is 'has roto'. The verb 'romper' in the second person singular form is 'has roto'. This is the correct form to use to match the subject 'tú'. The other options ('O has rompido', 'hemos roto', 'O hemos rompido') are incorrect because they do not match the subject and tense of the sentence.
Learn more about Spanish verbs conjugation