An Electron Is near a Positive Ion

An electron is near a positive ion. The electron moves toward the ion. Which of these statements is an accurate description of the work done by the ion on the electron?

A) The ion does zero work on the electron.
B) The work that the ion does on the electron is at the expense of the electron's electric potential energy.
C) The work that the ion does on the electron contributes to the electron's increase in electric potential energy.
D) The work that the ion does on the electron does not change the electric potential energy of the electron.