The imperfect form of the verb in the sentence is correct.
El capitán era el más feliz. It is in Spanish and the meaning of it in English is The captain was the happiest.
Imperfect tense is used to talk about past actions, conditions, or events that occurred regularly or frequently, or that were taking place at some point in the past. Here we use the verb ser conjugated as era, which represents the third person singular. This sentence also means superlatives. A superlative is a form of an adjective that expresses the highest possible amount of something, talking about what is the most or the least.
Hence, the answer is Correct.
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