Methane (CH₄) Is a Suitable Fuel for Burning Because It

Methane (CH₄) is a suitable fuel for burning because it is readily oxidized by oxygen gas, forming carbon dioxide and water. Hydrogen is also a good fuel for burning with oxygen gas, forming water as a product. What change in oxidation number always accompanies oxidation of a fuel?

A) a decrease
B) an increase
C) no change
D) The change varies with the reaction.
E) Oxidation number increases by 1 unit.