The possessive adjective that can be modified to match gender and number is:
<u>Vuestro</u>.
Explanation:
The possessive adjective <u>is a form of determinant that makes it possible to refer to the object or animal that someone possesses (directly), or to the familiarity that he has with a person (indirectly)</u>, in the case of the possessive adjective <em>"</em><u><em>vuestro,"</em></u> it has the particularity of changing allowing to identify the number and gender of the noun that is later, below I present the possible forms that it takes and the number and gender that refers:
<u><em>Vuestro</em></u><em>:</em>Singular and male.