Final answer:
The correct verb form is 'vivió'.
Step-by-step explanation:
The correct verb form that completes the sentence is OD. vivió.
When choosing the correct verb form, it is important to match the subject with the appropriate verb conjugation. In this sentence, the subject 'Mi hermana' is singular (referring to 'my sister'), so we use the third-person singular form of the verb 'vivir', which is 'vivió'.
Example: Mi hermana vivió en los Estados Unidos durante dos años.
Learn more about Verb conjugation in Spanish