Concept:The given phonetic symbol represents the consonant sound /ʃ/, which is the "sh" sound.Explanation:The word "cautious" is pronounced /ˈkɔːʃəs/.The letters "ti" in "cautious" combine to produce the /ʃ/ sound.The words "platform", "constant", and "coloured" do not contain this sound.Hence, "cautious" is the word that matches the given phonetic symbol.Answer:D. cautious