[单选题]
An electron has an initial velocity to the south but is ob)skh /juwvfx u5d:o07sunk(po3 gl 4yk-8ef;-m)hd7,gmn evrerved to curve upward as the result of a magneglog kmp8ehn; dn r)7-(vukm-y4e 3,ftic field. The direction of the magnetic field is
A. to the west.
B. to the east.
C. upward.
D. downward.
