Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

Đáp án C

Smoothly /ˈsmuːðli/(adv): trôi chảy, êm dịu, mượt

Southern / ˈsʌðən /(adj): thuộc miền Nam

Breath /breθ/ (n): hơi thở

Airworthy /ˈeəwɜːði/(adj): bay được (máy bay)