A wire placed on the plane of this screen carries a current toward the top of the screen. The wire feels a magnetic force toward the right. The direction of the magnetic field causing this force is

The answer to the question is;

The magnetic field causing the force is perpendicular to the screen, moving in an outward direction or coming out from the screen.

Explanation:

From Fleming's Left Hand Rule indicates that when we place a current carrying conductor in a magnetic field, a force will act on the conductor having a direction which is perpendicular to the magnetic field and current directions.

Therefore if the direction of the current is towards the top of the screen, and the direction of the force is towards the right of the screen, then the direction of the magnetic force is perpendicular to and coming out of the screen.