Why are metals good conductors of electricity?

The fact that metals are regarded as good electrical conductors is due to a variety of variables. One of the most important is that metals have free electrons, which aid in metallic bonding and are hence considered good conductors of electricity.

Learn about metals fundamentally so you can respond to the example given and understand them better;
Due to the loosely held electrons that make up an atom, metals are susceptible to losing their electrons. They are highly conductible and have little resistance. Basically, they have a lattice of atoms with unbound electrons, which makes them effective conductors of electricity.
However, as of right now, by examining the possibilities, we can conclude that option (C) will be accurate because metals do have low resistance, which eventually leads to the feature of being good electrical conductors.

Therefore, option (C) is correct.