Ethanol can be produced by fermentation and by the catalytic addition of steam to ethene. Which row shows an advantage of each method?
- Afrom sugar by fermentation: ethanol needs to be purified; from ethene and steam: the process is continuous
- Bfrom sugar by fermentation: it is a batch process; from ethene and steam: ethene comes from petroleum
- Cfrom sugar by fermentation: the process is slow; from ethene and steam: the process is rapid
- Dfrom sugar by fermentation: renewable resources are used; from ethene and steam: the ethanol produced is pure