Two Long Wires Are Parallel to Each Other

Multiple Choice

Two long wires are parallel to each other.The wires carry currents of different magnitudes.If the amount of current in each wire is halved,the magnitude of the force between the wires will be

A) twice the original force.
B) four times the original force.
C) the same as the original force.
D) half the original force.
E) one fourth the original force.