Chloretone, a hypnotic, is obtained when acetone reacts with chloroform in the presence of solid $\mathrm{KOH}$. Its structure is

1. A$(\mathrm{CH}{}_3){}_2\mathrm{C}(\mathrm{OH})-\mathrm{CCl}{}_3$, 1,1,1-trichloro-2-methylpropan-2-ol
2. B$(\mathrm{CH}{}_3){}_2\mathrm{CH}-\mathrm{CCl}{}_3$
3. C$\mathrm{CH}{}_3\mathrm{CH}(\mathrm{OH})\mathrm{CCl}{}_3$, 2,2,2-trichloroethanol-derived secondary alcohol
4. D$\mathrm{CH}{}_3\mathrm{COCCl}{}_3$, 1,1,1-trichloropropan-2-one