The reason the person above said ground state was because they probably assumed once the fireworks went off it got rid of all the electrons excited state. That is incorrect because ground state is the state of an electron (s) lowest energy point. That would be before you even light the fireworks to be set off, not after. After occurs emission, in which the fireworks go off anf color is released which would be photons. The answer is emission. Have a blessed day! :)