Which pair of reagents combine to produce a product containing a chiral carbon atom?
- A$\text{CH}_3\text{CH=CH}_2$ + $\text{HBr}$
- B$(\text{CH}_3)_2\text{C=O}$ + $\text{NaBH}_4$
- C$\text{CH}_3\text{CH}_2\text{CHO}$ + $\text{HCN}$
- D$\text{CH}_3\text{COOH}$ + $\text{CH}_3\text{CH}_2\text{OH}$