Concept:Identify the word whose underlined vowel sound is identical to that in “passage” (/ˈpæs.ɪdʒ/).Explanation:The underlined “a” in “passage” is pronounced /æ/.Check each option: “message” has /e/, “package” has /æ/, “mortar” has /ɔː/, and “partner” has /ɑː/.Therefore, “package” shares the same vowel sound /æ/ as “passage.”Answer:B. package