Which statement best describes balancing equations and the law of conservation of mass?

a. there are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products.

b. the number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.

c. there are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products.

d. there are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.