Final answer:
The correct word or phrase for the blank in the sentence el teléfono is has roto.
Step-by-step explanation:
The correct word or phrase for the blank in the sentence el teléfono would be has roto. This is because the subject tú (you) requires the form has roto, which is the second person singular in the present perfect tense. The other options, hemos roto and hemos rompido, are both in the first person plural and do not match the subject of the sentence.
Learn more about Using the correct verb form in Spanish sentences