Concept:The underlined part of the reference word is pronounced with the vowel sound /u/, as in could/kud/.Explanation:We need to identify which option has the same vowel sound.The reference word contains the short vowel sound /u/.Option B, could, is pronounced /kʊd/, with the same /υ/ sound.The other options have different vowel sounds: worn/o:n/, fun/fun/, and pan/pæn/.Answer:B. could