A -40-μC Charge Is Situated at the Origin of an Xy-Coordinate

A -4.0-μC charge is situated at the origin of an xy-coordinate system. Another -4.0 μC charge is at y = 4.0 m. What is the electric potential at a point x = 3.0 m due to these two charges?

A) -3600 V
B) 3600 V
C) -4800 V
D) 4800 V
E) 0 V