An organic compound $(X)$ with molecular formula $C_3H_6O$ is not readily oxidised. On reduction it gives $(C_3H_8O)$ $(Y)$ which reacts with $HBr$ to give a bromide $(Z)$ which is converted to a Grignard reagent. This Grignard reagent on reaction with $(X)$ followed by hydrolysis gives $2,3-$dimethylbutan$-2-$ol. Compounds $(X)$,$(Y)$ and $(Z)$ respectively are $:$

• A
  $CH_3COCH_3, CH_3CH_2CH_2OH, CH_3CH(Br)CH_3$
• B
  $CH_3COCH_3, CH_3CH(OH)CH_3, CH_3CH(Br)CH_3$
• C
  $CH_3CH_2CHO, CH_3CH_2CH_2OH, CH_3CH_2CH_2Br$
• D
  $CH_3CH_2CHO, CH_3CH=CH_2, CH_3CH(Br)CH_3$