A Charged Particle Moving Along the +X-Axis Enters a Uniform

Multiple Choice

A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis.A uniform electric field is also present.Due to the combined effect of both fields,the particle does not change its velocity.What is the direction of the electric field?

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