A Sphere with Radius 2 $+ 2.0 \mu \mathrm { C }$

Multiple Choice

A sphere with radius 2.0 mm carries a $+ 2.0 \mu \mathrm { C }$ charge. What is the potential difference, $V _ { B } - V _ { A }$ between point B, which is $4.0 \mathrm {~m}$ from the center of the sphere, and point A, which is $6.0 \mathrm {~m}$ from the center of the sphere?
(k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

A) 1500 V
B) -1500 V
C) 170 V
D) -0.63 V