Which of the following on heating with aqueous $\text{KOH}$, produces acetaldehyde?

Geminal dihalides like ethylidene chloride (${\text{CH}}_3{\text{CHCl}}_2$) undergo hydrolysis with aqueous $\text{KOH}$ to form an unstable intermediate with two $-OH$ groups on the same carbon, which loses water to form acetaldehyde.
$${\text{CH}}_3{\text{CHCl}}_2+2\text{KOH(aq)}\to {\text{CH}}_3{\text{CH(OH)}}_2\to {\text{CH}}_3\text{CHO}+{\text{H}}_2\text{O}$$