Chloroethane may be made from bromoethane in two stages. $\text{C}_2\text{H}_5\text{Br} \xrightarrow{\text{step } X} \text{C}_2\text{H}_5\text{OH} \xrightarrow{\text{step } Y} \text{C}_2\text{H}_5\text{Cl}$ Which of the following statements about these stages are true?
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only