Choose the word whose underlined part is pronounced differently from that of the others

The Pronunciation of ‘o / O’
Choose the word whose underlined part is pronounced differently from that of the others.
A. shot B. knot C. joke D. pot
A. note B. close C. show D. blogger
A. lock B. what C. bottle D. store
A. before B. lorry C. worry D. cordless
A. warm B. worm C. quarter D. wharf
A. bought B. enough C. tough D. come
A. bowl B. bowing C. now D. row
A. boss B. cost C. lost D. host