Answer:
The option (B) is correct.
Step-by-step explanation:
The magnetic force between the two current carrying wires is given by

where, I and I' be the currents in the wires and r is the distance between the two wires.
Here, we observe that the force between the wires is inversely proportional to the distance between them.
So, when the distance is doubled , let the new force is F'.

So, option (B) is correct.