Two small similar metal spheres A and B having charges 4q and – 4q, when placed at a certain distance apart, exert an electric force F on each other. When another identical uncharged sphere C, first touched with Athen with B and then removed to infinity, the force of interaction between A and B for the same separation will be
Options:
(a) F/2
(b) F/8
(c) F/16
(d) F/32