Which One of the Following Statements Best Explains Why It

Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?

A) Work must be done to bring two positive charges closer together.
B) Like charges repel one another and unlike charges attract one another.
C) A positive charge will gain kinetic energy as it approaches a negative charge.
D) The work required to bring two charges together is independent of the path taken.
E) A negative charge will gain kinetic energy as it moves away from another negative charge.