The ester $\mathrm{C_2H_5CO_2CH_2CH_2CH_3}$ may be synthesised in a school or college laboratory by carrying out a sequence of reactions that uses compound X as the only organic starting material. Which compound could X be?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct