Concept:The given phonetic symbol represents the diphthong /ei/, a vowel sound commonly heard in words like "day".Explanation:Pronounce each option carefully and identify its vowel sound.A. "alone" is pronounced /əˈləʊn/; it does not contain the /ei/ sound.B. "greet" is pronounced /gri:t/; it has a long /i:/ sound, not /eI/.C. "height" is pronounced /hait/; it contains the /aI/ diphthong, not /ei/.D. "neigh" is pronounced /nei/; it ends with the exact sound /ei/.Therefore, the word that contains the sound represented by the given phonetic symbol is "neigh".Answer:D. neigh