A plth ball electroscope is negatively charged after coming in contact with a charged rod. Which statement best describes what happens?

a) The electrons move from the pith ball to the charged rod.

b) The electrons move from the charged rod to the pith ball.

c) The protons move from the pith ball to the charged rod.

d) The protons move from the charged rod to the pith ball.

e) The neutrons move from the pith ball to the rod.