Which of These Statements Best Explains the Law of Conservation

Which of these statements best explains the Law of Conservation of Mass?

A) All atoms of a given element have the same weight.
B) Atoms of different elements combine in fixed whole number ratios.
C) The weight of an object is neither created nor destroyed in a chemical reaction.
D) All samples of a given compound have the same proportion of constituent elements.
E) The sum of the masses of the reactants equals the sum of the masses of the products in any normal chemical reaction.