Concept:Identify the word whose underlined vowel sound matches the vowel sound in “month”.Explanation:The word “month” is pronounced /mʌnθ/.The underlined letter “o” represents the vowel sound /ʌ/.Now check each option:A. “mug” is pronounced /mʌɡ/ — it has the same vowel sound /ʌ/.B. “font” is pronounced /fɒnt/ — vowel sound is /ɒ/.C. “cost” is pronounced /kɒst/ — vowel sound is /ɒ/.D. “moth” is pronounced /mɒθ/ — vowel sound is /ɒ/.Only “mug” shares the same vowel sound as “month”.Answer:A. mug