Final answer:
The sentence "Rosa vivía en Londres" is grammatically correct with the imperfect form of the verb vivir.
Step-by-step explanation:
The sentence "Rosa vivía en Londres" is grammatically correct with the imperfect form of the verb vivir. In Spanish, the imperfect tense is used to talk about past actions or states that were ongoing, habitual, or repeated. In this sentence, it represents Rosa's past continuous action of living in London.
Learn more about Spanish verb conjugation