what is the smallest packet of electromagnetic energy that can be absorbed or emitted?\no a proton\no an…

Brief Explanations:

In physics, photons are the fundamental particles of light and the smallest packets of electromagnetic energy. They can be absorbed or emitted during electromagnetic - related processes. Protons are sub - atomic particles in the nucleus, electrons are sub - atomic particles outside the nucleus, and a wave is a more general concept not the smallest packet of electromagnetic energy.

Answer:

C. a photon