The Net Work Done in Moving an Electron from Point

The net work done in moving an electron from point A at -50. V to point B at +50. V along the semi-circle path shown in Figure 16-1 is

A) zero.
B) -1.6 J.
C) +1.6 × 10^-17 J.
D) -1.6 × 10^-17 J.
E) not to be determined; not enough information given.