its high density
its high polishing
its chemical inertness
presence of free electrons
Answer is Right!
Answer is Wrong!
The correct answer is D. presence of free electrons.
The luster of a metal is due to the presence of free electrons. These electrons are able to move freely within the metal, and they reflect light in a way that produces a shiny appearance.
Option A is incorrect because the density of a metal does not affect its luster.
Option B is incorrect because the polishing of a metal does not affect its luster.
Option C is incorrect because the chemical inertness of a metal does not affect its luster.