The correct answer is option 2: out of the page.

When an electron moves in the presence of a magnetic field, it experiences a force known as the magnetic force. This force is perpendicular to both the velocity of the electron and the magnetic field.

In the given figure, the electron is moving upwards, and the magnetic field lines are directed into the page. Since the magnetic force is always perpendicular to the velocity, it will act in a direction that is perpendicular to both the page and the velocity. This means that the force will be directed out of the page.

Option 1, into the page, is incorrect because it suggests that the force acts in the opposite direction. Option 3, opposite to the motion of the electron, is also incorrect because the force is not directly opposed to the motion, but rather perpendicular to it. Option 4, along the motion of the electron, is incorrect because the force is perpendicular to the motion, not along it.

Therefore, the correct answer is option 2: out of the page.