Final answer:
The sentence "El capitán era el más feliz." is correct in its imperfect verb form.
Step-by-step explanation:
The sentence "El capitán era el más feliz." is correct. It uses the imperfect form of the verb "ser" (to be) in the past tense, which is "era". The subject "el capitán" is correctly matched with the conjugated verb form "era". In this sentence, the imperfect tense is used to describe a previous state or ongoing action in the past, indicating that the captain used to be the happiest.
Learn more about Spanish verb conjugation