Which reason best explains why metals are shiny? because their valence electrons reflect light/ because their valence electrons absorb light/ because their valence electrons oscillate between bands/ because their valence electrons move to higher energy levels

Option (c) is the correct answer.

Explanation:

It is known that metals have free electrons. These free electrons when come in contact with light, vibrate or oscillate at their respective position. As a result, the electrons gain small amount of energy and when this energy is released the surface of metal  shines.

Thus, we can conclude that metals are shiny because their valence electrons oscillate between bands.