Final answer:
The correct verb to fill in the blank is 'son'.
Step-by-step explanation:
The subject of this question is Spanish. The question asks for the correct verb to fill in the blank with the subject 'Ellos' and the country 'Perú'. To determine the correct verb, we need to consider the conjugation rules for verbs in Spanish.
In this case, the correct verb is 'son'. We use the verb 'ser' (to be) when describing nationality or origin, so 'Ellos son de Perú' means 'They are from Peru'.
It is important to note that the verb 'ser' is used for more permanent characteristics, while the verb 'estar' is used for temporary states or conditions.
Learn more about Spanish verbs