#### Answer

The correct answer is:
(c) moves perpendicular to the magnetic field

#### Work Step by Step

The magnetic force on a point charge is proportional to $sin~\theta$, where $\theta$ is the angle between the velocity vector and the magnetic field. Therefore, the force is largest when $\theta = 90^{\circ}$
The correct answer is:
(c) moves perpendicular to the magnetic field