2. A beam of electrons is sent horizontally to the right toward a fluorescent screen. On the way, the electrons encounter a uniform magnetic field which causes them to be deflected upward and hit the screen at a point above the level of the original beam (see figure). In which direction is the magnetic field pointed?
A. upward
B. downward
C. out of the page
D. into the page
E. A magnetic field could not deflect the beam upward since it does no work on a charged particle