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