A Sphere with Radius 2 $\times$ 10⁹ N·m²/C²

A sphere with radius 2.0 mm carries a 1.0 μC charge.What is the potential difference,VB - VA,between point B 4.0 m from the center of the sphere and point A 9.0 m from the center of the sphere? (The value of k is 9.0 $\times$ 10⁹ N·m²/C². )

A) 1300 V
B) -1300 V
C) 140 V
D) -0.45 V