Concept:Find the vowel sound of the underlined letters and choose the word that has the same vowel sound.Explanation:The underlined letters in "south" give the vowel sound /aʊ/."south" is pronounced /sauθ/.Check the options:A. drought → /draut/ — contains /aʊ/.B. foal → /foʊl/ — has /oʊ/, not /au/.C. southerners → /ˈsʌðənəz/ — has /∧/, not /aʊ/.D. doughy → /ˈdoʊi/ — has /oυ/, not /aʊ/.Therefore, "drought" has the same vowel sound as the underlined letters in "south".Answer:A. drought