[单选题]
Two charged objects +( gco7ooop di /w9(vtattract each oth/iuwmbqj1tx /(1j0 tcer with a certain force. If the charges on i /mq0(xctt 11bwju/j both objects are doubled 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.
