Concept:The underlined letters "ur" in "purse" produce the same vowel sound as the word "first".Explanation:The word "purse" is pronounced as /pε:s/.The letters "ur" here give the long vowel sound /3:/.Check each option:"currant" has the vowel sound v as in "cup"."leisure" has the vowel sound /e/ (British) or /i:/ (American)."first" is pronounced /f3:st/, with the same vowel sound /ε:/."sure" has the vowel sound /ʊə/ or /o:/.Therefore, the correct match is "first".Answer:C. first