Correct Answer: Option D

Explanation

The characteristic shine or lustre of a metal is primarily caused by the presence of free (delocalized) electrons on its surface. 

Light Interaction: When light strikes a metal, these mobile electrons absorb the light energy.

Reflection: The electrons oscillate and immediately re-emit the energy as light, resulting in specular reflection that gives metals their shiny appearance.

Visibility: Because metals are opaque, light cannot pass through them; it is instead reflected by this "sea of electrons" back to our eyes.

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