Three Charged Particles Are Positioned in the Xy Plane: a 50-NC

Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a −80-nC charge at x = −4 m on the x axis, and a 70-nc charge at y = −6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?

A) +81 V
B) +48 V
C) +5.8 V
D) −72 V
E) −18 V