Use the Following Figure to Answer the Next Problem

Multiple Choice

Use the following figure to answer the next problem: Two equal positive charges are placed x m apart.The equipotential lines are at 100 V interval.
-The work required to move a third charge,q = e,from the 100 V line to b is

A) 100 eV
B) 100 eV
C) 200 eV
D) 200 eV
E) zero