Two Point Charges Are Held at the Corners of a Rectangle

Two point charges are held at the corners of a rectangle as shown in the figure. The lengths of sides of the rectangle are 0.050 m and 0.150 m. Assume that the electric potential is defined to be zero at infinity.
-Determine the electric potential at corner A.

A) +6.0 × 10⁴ V
B) -2.4 × 10⁵ V
C) +4.6 × 10⁵ V
D) -7.8 × 10⁵ V
E) zero volts