Two Positively Charged Bodies Are Moving in Opposite Directions on Parallel

Multiple Choice

Two positively charged bodies are moving in opposite directions on parallel paths that lie in the xz plane. Their speeds are equal and their trajectories are equidistant from the x axis. The magnetic field at the origin, due to the motion of these charged bodies will be

A) in the x direction.
B) in the y direction.
C) in all directions.
D) in the z direction.
E) zero.