A -10 NC Charge Is Moved from (2

A -1.0 nC charge is moved from (2.0 cm, 2.0 cm) to (-2.0 cm, -1.0 cm) in the electrostatic field created by the two charges in the figure here. The change in the potential energy of the three-charge system is

A) 1.5 *10^-7 J.
B) 1.5 * 10^-9 J.
C) -1.5 * 10^-7 J.
D) -1.5 * 10^-9 J.
E) 32 * 10^-7 J.