Final answer:
The given sentence "Rosa vivia en Londres." is correct in its imperfect form, indicating Rosa used to live in London.
Step-by-step explanation:
The given sentence "Rosa vivia en Londres." is correct in its imperfect form. The imperfect form of the verb "vivia" indicates an ongoing or habitual action in the past. In this case, it tells us that Rosa used to live in London. The imperfect tense is often used to describe actions or states that were in progress at a specific time in the past or used to happen repeatedly.
Learn more about Imperfect form of the verb in Spanish