When 20 C of Charge Moves at Constant Speed Along a a Path

When 2.0 C of charge moves at constant speed along a path between two points differing in potential by 6.0 V, the amount of work done by the field is

A) 2 J.
B) 3 J.
C) 6 J.
D) 12 J.
E) 24 J.