Sophia performs an experiment in which she adds 10.0 grams of zinc metal to 25.0 grams of bromine. She claims that mass will be conserved during the reaction. Which of the following best supports her claim?

A. The mass of the final product will be equal to the mass of the zinc metal, 10.0 grams.

B. The mass of the final product will be equal to the difference between the two masses, 15.0 grams.

C. The mass of the final product will be equal to the mass of the bromine, 25.0 grams.

D. The mass of the final product will be equal to the total mass of both reactants, 35.0 grams.