Concept:Identify the vowel sound in the underlined letters and match it to the same sound in one option.Explanation:In powder, the underlined letters "ow" make the sound /aυ/, like in "how" or "loud".Now check the options.low has the sound /oυ/.loud has the sound /au/.tour has the sound /ʊə/ or /o:/.potty has the sound /o/.So, loud shares the same vowel sound as powder.Answer:B. loud