A Solid Conducting Sphere (Radius = 5

A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?

A) 23 V
B) 30 V
C) 15 V
D) 45 V
E) 60 V