Final answer:
The imperfect form of the verb 'ser' in 'Eran las cinco de la tarde' is correct.
Step-by-step explanation:
The imperfect form of the verb in the sentence 'Eran las cinco de la tarde' is correct. In Spanish, the imperfect tense is used to describe ongoing or habitual actions in the past. In this sentence, 'eran' is the imperfect form of the verb 'ser' (to be), indicating that it was 5 o'clock in the afternoon.
Learn more about Spanish verb conjugation