Two Long, Parallel Wires Are Spaced 1 M Apart in Air

Two long, parallel wires are spaced 1 m apart in air, and you have established a current of 1 A in each. The force per unit length that each wire exerts on the other is approximately

A) 2 × 10^-6 N/m.
B) 2 × 10^-5 N/m.
C) 2 × 10^-7 N/m.
D) 2 $\pi$ × 10^-5 N/m.
E) 2 $\pi$ × 10^-6 N/m.