An electron at rest is subjected to two simultaneous constant magnetic fields; one is in the ax direction and the other is in the ay direction. The electron will:

never move

Explanation:

Just like an electric current, we can only see the effects of magnetism when an electron is subjected to two simultaneous constant magnetic fields.

An electron at rest that is subjected to a magnetic field will never move but only in an electric field. The electrons are subjected to an electric force collinear with the electric field but in the opposite direction (the charge is negative).The acceleration vector tends to be in the same direction as the force, opposite the electric field.