The correct option is A carbon dioxide, water
Methane (CH4), a hydrocarbon, on complete combustion, reacts with oxygen in the atmosphere to produce carbon dioxide (CO2) and water. During this reaction, a lot of heat is released.
CH4(g)+ 2O2(g) Δ→ CO2(g)+ 2H2O(aq)+ HeatMethane Oxygen Carbon Water dioxide