Clean, dry air is made up of nitrogen, oxygen and small quantities of other gases. The noble gases are missing from the table. Which row gives the composition of clean, dry air?
- Anitrogen 21%; oxygen 78%; other gases: small amount of carbon dioxide
- Bnitrogen 21%; oxygen 78%; other gases: small amount of carbon monoxide
- Cnitrogen 78%; oxygen 21%; other gases: small amount of carbon dioxide
- Dnitrogen 78%; oxygen 21%; other gases: small amount of carbon monoxide