In this conversation, one person is asking if the other person's uncle Beto is married. The response is that uncle Beto is not married. To complete the sentence, we need to choose the correct option to fill in the blank.
Let's analyze each option:
a. divorciado - This means divorced. It's used when someone was previously married but is no longer.
b. separado - This means separated. It's used when a married couple is living apart but are not officially divorced.
c. muerto - This means dead. It has no relation to marital status.
d. soltero - This means single. It's used to describe someone who has never been married.
Given that uncle Beto never got married, the correct option to fill in the blank would be d. soltero.