Answer: Option (A) is the correct answer.
Step-by-step explanation:
A conductor is defined as a substance through which an electric current is able to flow freely without causing any resistance due to the availability of free electrons.
For example, silver, copper, gold etc are all good conductors of electricity.
Whereas an insulator is a substance which causes high resistance to the flow of free electrons.
For example, plastics, styrofoam, rubber etc are all insulators.
Thus, we can conclude that a body that offers little resistance to the movement of free electrons from one point to another is a conductor.