Final answer:
The correct verb form to complete the sentence is 'leyeron'.
Step-by-step explanation:
The correct verb form to complete the sentence is leyeron.
Claudia y Juan is the subject of the sentence, which is plural. Therefore, the verb form that agrees with the subject is leyeron, the third person plural form of the verb leer (to read).
Example: Claudia y Juan leyeron cinco leyendas a los niños en la biblioteca.
Learn more about Spanish verb forms