Concept:The symbol /ɪ/ represents a short vowel sound, as in the word "sit".Explanation:The word "key" is pronounced /kiː/, with a long /iː/ sound.The word "brief" is pronounced /briːf/, with a long /iː/ sound.The word "guilt" is pronounced /ɡɪlt/, and it contains the short /ɪ/ sound.The word "seize" is pronounced /siːz/, with a long /iː/ sound.Therefore, only "guilt" matches the given phonetic symbol.Answer:C. guilt