a
energy is being absorbed by the atoms
b
energy is being released from the atoms
c
protons are moving into higher energy levels.
d
electrons are moving into higher energy levels.
Seeing light from fireworks implies that energy is being released from the atoms. This is an excitation as the electrons within the atom moves from a higher energy level to a lower energy level.
When electrons undergo this kind of transition, energy is released.
The radiation produced is dispersed out and it is seen as colorful lights.
