Answer: Option (A) is the correct answer.
Explanation:
Metallic luster is defined as the shine present on the surface of metals. Since, metals contain more number of electrons and in order to get stabilized they need to lose their valence electrons.
Therefore, when they are placed in light then these electrons get excited and as a result, the surface of metal appears shiny.
So, out of the given options only gold is also a metal whereas quartz, feldspar, and diamond are all minerals and not metals.
Thus, we can conclude that out of the given options gold has a metallic luster.
