Consider three identical metal spheres, A, B, and C. Sphere A has a charge of -2μC; sphere B has a charge of -6μC; and sphere C has a charge of +4μC. Spheres A and B are touched together and then separated. Spheres B and C are then touched and separated. Does sphere C end up with an excess or a deficiency of electrons and how many electrons is it?
A) deficiency, 6x1013
B) excess, 3x1013
C) excess, 2x1013
D) deficiency, 3x1012
E) There is no imbalance of electrons.