Which of the following gives a yellow precipitate on warming with $\mathrm{I}{}_2$ and aqueous $\mathrm{NaOH}$?

Compounds containing $\mathrm{CH}{}_3-\mathrm{CH}(\mathrm{OH}){}^{-}$ (or $\mathrm{CH}{}_3-\mathrm{CO}{}^{-}$) groups undergo the iodoform reaction to give yellow $\mathrm{CHI}{}_3$. Propan-2-ol is oxidised by hypoiodite to propanone, which gives iodoform; the others lack this unit.