An Electron Moving Along the +X-Axis Enters a Magnetic Field

Multiple Choice

An electron moving along the +x-axis enters a magnetic field.If the electron experiences a magnetic deflection in the -y direction,then the magnetic field must have a component

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