The ester $\text{C}_2\text{H}_5\text{CO}_2\text{CH}_2\text{CH}_2\text{CH}_3$ may be prepared in a school or college laboratory by using compound Z as the only organic starting material in a route of four reactions or fewer. What could the identity of compound Z be?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only