Answer:
Possessive pronouns are replacements of nouns that are used to show possession. In the sentence given, the possessive pronoun that also serves as an adjective is His. It acts as an adjective in the phrase, "his jeans."
-The possessive pronoun shows that something belongs to another person. The possessive pronoun that also acts as an adjective in the sentence is the phrase; His jeans.
-'His' tells us who the jeans belong to. It also qualifies the jeans by telling its owner.
-Therefore, "his jeans," is the possessive pronoun being used as an adjective.