The net force is the sum of all of the forces on the charged object.  The only forces acting on the charged object in this simulation are the electric and magnetic forces.  Hence, in this simulation,

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Notice that each of the terms in this equation are vectors.  Vectors can be added graphically by arranging them head-to-tail. 

You indicated that the direction of the electric field at point B is direction 1 and the direction of the magnetic field is direction 4.  You did not indicate whether the electric or the magnetic force is larger.  Hence both possibilities are illustrated below. 

Notice that in both cases, when the electric and magnetic forces are arranged tail to tail, then the net force lies between them.  Put another way, if it is unknown whether the electric or magnetic force is bigger, then the net force could point in either of the directions illustrated above.  Thus, graphically summing the forces does not give a unique direction for the net force.

Remember, however, that the net force is related to the acceleration through Newton’s Second Law:

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Newton’s Second Law is a vector equation.  Since the mass is a positive scalar, the two vectors in the equation must have the same direction.  Hence, the direction of the net force, , is the same as the direction of the acceleration, .  Which of the diagrams above shows a net force that has the same direction as the acceleration?