Concept:Electric force does work on a charge, converting electric potential energy into kinetic energy.Explanation:When a charge moves in the direction of the electric force, the force does positive work on the charge.Positive work increases the kinetic energy of the charge.As the charge moves in the direction of the electric force, its electric potential energy decreases.Therefore, the charge loses potential energy and gains kinetic energy.Answer:C. loses potential energy and gains kinetic energy