C

Step 1: Analyze the forces acting on the electron. In an electric field, a charged particle (like an electron) experiences an electric force given by the equation:
$$ F_e = qE $$
where q is the charge of the electron (which is negative), and E is the electric field strength.

Step 2: As the electric field exerts a force in the direction of the field (which is opposite to the direction of the electron due to its negative charge), the electron will experience a force that acts against its motion. This results in deceleration.

Step 3: In addition, the magnetic field produces a magnetic force on a moving charge given by:
$$ F_m = q( extbf{v} imes extbf{B}) $$
where v is the velocity vector of the electron, and B is the magnetic field vector. Since the velocity is aligned with the electric field and, in turn, aligned with the magnetic field, the cross product will yield a force perpendicular to both the velocity and the magnetic field direction. However, since the electric force dominates here, the overall effect will still be deceleration in the direction of motion.

Step 4: Therefore, combining the effects, the electron will get decelerated due to the electric field that acts against its velocity.
Hence, the correct answer is: Option C: get decelerated.