Methane gas is burned to provide heat. The chemical reaction for this process is shown in the equation below.
CH4 + 2O2 CO2 + 2H2O + energy
What are the products in this chemical reaction?

A. O2 + CO2 + energy
B. CO2 + CH4
C. CO2 + 2H2O + energy
D. CH4 + 2O2