[单选题]
Two charged objects attract each other with a certain force. tc sg.ks,-y qg/:5u ry If the charges9q,wlcfi, r -yvbjl:8 on both objects are d jv,9q-:ifylbc8, lrwoubled with no change in separation, the force between them
A. quadruples.
B. doubles.
C. halves.
D. increases, but we can't say how much without knowing the distance between them.
