Final answer:
The correct answer is "estás".
Step-by-step explanation:
The correct answer to fill in the blank in the dialogue is estás. In this conversation, Sr. Marcos is asking Jorge how he is, which requires the use of the verb "to be" in Spanish. Since Jorge is a familiar acquaintance, the correct form of the verb to use is estás, which means "you are" in Spanish.
Learn more about Spanish verb conjugation