Final answer:
The correct answer is 'ha comido'. It indicates that at some point in the past, the sister has eaten paella.
Step-by-step explanation:
The correct answer is ha comido. The sentence "Mi hermana nunca come la paella" expresses a general truth or a habitual action, which is why the present perfect tense is used. The verb phrase "ha comido" is formed by the present tense of the auxiliary verb "haber" followed by the past participle of the verb "comer". This tense translates to "has/have eaten" in English. It indicates that at some point in the past, the sister has eaten paella.
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