Concept:Identify the vowel sound in “boot” and select the option whose vowel sound is identical.Explanation:In the word “boot,” the letters “oo” are pronounced as the long vowel sound /u:/.Now examine the vowel sound in each option.A. “louse” has the diphthong /au/, so it does not match.B. “bull” has the short vowel /u/, so it does not match.C. “cook” also has /υ/, so it does not match.D. “ruse” contains the long vowel /u:/, which is the same sound as in “boot.”Answer:D. ruse