A chemical reaction is a reaction in which old bonds break in the reactant side and new bonds formed in the product side and the product have different properties from the reactant.
But in chemical reaction there is no changing of elements from reactant side to product side.
So, option D is correct means a chemical reaction does not involve changing of the atoms of an element into those of another element to form new products.
Final answer: Option D is correct means a chemical reaction does not involve changing of the atoms of an element into those of another element to form new products.