Propanal reacts with hydrogen cyanide to give 2-hydroxybutanenitrile. One suitable catalyst for this reaction is sodium cyanide. $\text{CH}_3\text{CH}_2\text{CHO} + \text{HCN} \xrightarrow{\text{NaCN}} \text{CH}_3\text{CH}_2\text{CH(OH)CN}$ Which of the following statements about the reaction of propanal with hydrogen cyanide are correct?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only