Which compound exhibits optical isomerism and produces a positive result with alkaline aqueous iodine?
- A$\text{CH}_3\text{COCH(OH)CH}_3$
- B$\text{CH}_3\text{COCH}_2\text{CH}_2\text{OH}$
- C$\text{HOCH}_2\text{CH(CH}_3)\text{CHO}$
- D$(\text{CH}_3)_2\text{C(OH)CHO}$