Force on Moving Charges: an Electron Moving in the Direction

Multiple Choice

Force on moving charges: An electron moving in the direction of the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the

A) +z-axis.
B) -z-axis.
C) -x-axis.
D) +y-axis.
E) -y-axis.