Answer:
"Our".
Explanation:
An antecedent is a word that a noun or a pronoun refers to. In other words, an antecedent refers to the pronoun in a sentence.
In the given sentence
"We own and operate our own grocery store and café"
the pronouns are "we" and "own".
Now, the antecedent for these pronouns is "our", which means "related to, belonging to us."
Thus, the antecedent is "our".
