Some characteristics of four fuels are shown. Which fuel is a gas at room temperature and produces two products when it burns in an excess supply of air?
- Ahydrogen, $\text{H}_2$
- Bmethane, $\text{CH}_4$
- Coctane, $\text{C}_8\text{H}_{18}$
- Dwax, $\text{C}_{31}\text{H}_{64}$