After Landing on an Unexplored Klingon Planet,Mr $\vec { B }$

After landing on an unexplored Klingon planet,Mr.Spock investigates the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations: A magnetic force in the northwest direction is exerted on the clectrons moving upward.
Electrons moving horizontally toward the north are pushed downward.
Electrons moving horizontally toward the southeast are pushed upward.
Mr.Spock therefore concludes that the $\vec { B }$ field at this landing site is in which direction?

A) toward the east
B) toward the northeast
C) toward the southwest
D) toward the southeast
E) toward the west