Final answer:
The correct form of the verb is 'tendrán'.
Step-by-step explanation:
The correct form of the verb in this sentence is tendrán. The subject of the sentence, 'Sofía y Carlos,' is a third-person plural, so we use the corresponding conjugation of the verb 'tener,' which is 'tendrán.' This form matches the subject and agrees in number and person.
Learn more about Verb conjugation in Spanish