At the Instant the Positively Charged Body Is at the Origin

Multiple Choice

At the instant the positively charged body is at the origin, the magnetic field at point P due to the motion of this charged body is in the negative x direction. The charged body must be moving

A) in the negative z direction.
B) in the positive y direction.
C) in the positive x direction.
D) in the negative y direction.
E) in the positive z direction.