Concept:Grounding a charged conductor allows excess charges to flow between the conductor and the Earth.
Explanation:The negatively charged metal rod holds an excess of electrons.
The person grips the rod and stands bare-footed, which creates a continuous conducting path from the rod to the ground.
The human body contains fluids and ions that can conduct charge, so it does not block the movement of electrons.
Because like charges repel, the excess negative charges push each other away from the rod.
They travel down through the person’s body and into the Earth, which acts as a huge reservoir for charge.
Therefore, the rod loses its negative charge as the electrons leak into the ground.
Only negative charges move in this process; positive charges in the ground do not travel through the body.
Answer:A. negative charges flow to the ground through the person's body