The table lists some properties of four fuels. Which fuel is a gas at room temperature and produces two products when it burns in an excess of air?
- Ahydrogen, $\text{H}_2$, melting point $-259\,^{\circ}\text{C}$, boiling point $-253\,^{\circ}\text{C}$
- Bmethane, $\text{CH}_4$, melting point $-182\,^{\circ}\text{C}$, boiling point $-164\,^{\circ}\text{C}$
- Coctane, $\text{C}_8\text{H}_{18}$, melting point $-57\,^{\circ}\text{C}$, boiling point $126\,^{\circ}\text{C}$
- Dwax, $\text{C}_{31}\text{H}_{64}$, melting point $60\,^{\circ}\text{C}$, boiling point $400\,^{\circ}\text{C}$