Concept:The underlined vowel sound is the diphthong /əʊ/, like in the word "grow".Explanation:"Sower" is pronounced as /ˈsəʊə/, so it contains the same vowel sound /əʊ/."Fewer" is pronounced with /juːə/, not /əʊ/."Grew" has the long vowel sound /uː/."Floor" has the vowel sound /ɔː/.Thus, only option A has the required vowel sound.Answer:A. sower