The products of the reaction are the molecules on the right, thus water and carbon dioxide, hence we eliminate choice 4. Every time the reaction takes place, 14 molecules of CO2 are created and 6 molecules of H2O by the stoicheiometry of the reaction. This ratio will remain throughout the whole reaction, however many reactants are used up. Hence, the correct ratio is CO2:H2O=14:6, answer a).
