Concept:Identify the vowel sound in the given word and match it to the option with the same sound.
Explanation:The underlined vowel sound in "powder" is /aʊ/, like the sound in "how".
Check each option for its vowel sound.
"potty" has /ɒ/, so it is not correct.
"tour" has /ʊə/ or /ɔː/, so it is not correct.
"low" has /oʊ/, so it is not correct.
"lout" has the diphthong /aʊ/, which matches the vowel sound in "powder".
Answer:B. lout