The diagram illustrates how ethanol is made and shows some important chemistry of ethanol. Substance X $\xrightarrow{\text{fermentation}}$ ethanol $\xrightarrow{\text{process Y}}$ carbon dioxide + substance Z. Which substances are X, Y and Z?
- AX: yeast, Y: combustion, Z: oxygen
- BX: glucose, Y: combustion, Z: steam
- CX: glucose, Y: polymerisation, Z: water
- DX: yeast, Y: fermentation, Z: glucose