Concept:The target vowel sound is /eɪ/, the sound heard in "day".Explanation:Say each option aloud to identify its vowel sound."West" has the vowel /ɛ/."Height" has the vowel /aɪ/."Says" has the vowel /ɛ/."Heinous" is pronounced /ˈheɪnəs/, so its first syllable contains the /eɪ/ sound.Thus, only "heinous" has the same vowel sound as the underlined part.Answer:D. heinous