A Sphere with Radius 2

Multiple Choice

A sphere with radius 2.0 mm carries +1.0 μC of charge distributed uniformly throughout its volume. What is the potential difference, VB - VA, between point B, which is 4.0 m from the center of the sphere, and point A, which is 9.0 m from the center of the sphere? (k = 1/4πε0 = 8.99 × 10⁹ N ∙ m²/C²)

A) 1200 V
B) -1200 V
C) 140 V
D) -0.45 V