To know the coefficients we must balance the equation. To balance it we count the atoms of each element on each side of the reaction. In the following image I will count the atoms and I will modify them as the coefficients are placed:
We start by balancing the carbon. We have 4 carbons in the reactants, so we put the coefficient 4 in front of the CO2 molecule. I will update the image and recount the atoms.
Now we continue with the hydrogen, we have 10 hydrogens in the reactants, we put the coefficient 5 in the H2O molecule to have the same amount of hydrogens. I will update the image and recount the atoms.
Now we continue with the oxygen, we have 13 oxygens in the products. We put the coefficient 13/2 in the O2 molecule. I will update the image and recount the atoms.
We have the balanced equation. To get integers we multiply the equation by 2. I will update the image and recount the atoms.
So, the answer will be: D) 13