The Drawing Shows Two Long, Thin Wires That Carry Currents

The drawing shows two long, thin wires that carry currents in the positive z direction.Both wires are parallel to the z axis.The 50-A wire is in the x-z plane and is 5 m from the z axis.The 40-A wire is in the y-z plane and is 4 m from the z axis.What is the magnitude of the magnetic field at the origin?

A) zero tesla
B) 1 × 10^-6 T
C) 3 × 10^-6 T
D) 4 × 10^-6 T
E) 6 × 10^-6 T