What are the reactants in the reaction: CH4 + 2O2 → CO2 + 2H2O?

Methane and Oxygen

Carbon dioxide and Water

Hydrogen and Oxygen

Carbon and Water

The reactants in the reaction are Methane (CH4) and Oxygen (O2).
These two substances combine to form the products Carbon Dioxide (CO2) and Water (H2O), releasing energy in the process.