Answer: D) D
Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
As the atoms should remain conserved thus there should be 3 yellow atoms, three red atoms and 4 blue atoms in the products.
Thus the correct option is D.
