A positive test charge is moved slowly from point A to point B inside a region where only electrostatic forces act. The two points have the same electric potential difference regardless of whether the charge travels along a straight line or along a semicircular path. Which statement best describes the work done by the electric field on the charge?
a) The work is greater along the semicircular path because the charge travels a longer distance.
b) The work is zero for both paths because the potential at A and B is the same.
c) The work is the same for both paths because electrostatic forces are conservative.
d) The work is zero for both paths because the charge moves slowly.