A Wire of Length L Carries a Current I, Going

A wire of length L carries a current I, going from west to east, in the presence of a magnetic field B that is pointing vertically up. The wire moves a distance d to the south. The work done by the magnetic force on the moving charges is

A) "+ILlBd."
B) "-ILBd."
C) "+IL²B/d."
D) "-IL²B/d."
E) "zero."