In the Figure Shown, Is a Chemical Reaction Occurring

In the figure shown, is a chemical reaction occurring?

A) No, because there are the same number of atoms in both images.
B) Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C) No, because there are oxygen atoms and nitrogen atoms in both images.
D) No, because both the reactants and products are colorless gases.
E) Yes, because the reactants are gases, but the product is a solid.