A Solid Spherical Dielectric Having $K = 3.1$ And Radius of 6

Multiple Choice

A solid spherical dielectric having $K = 3.1$ and radius of 6.2 cm has -3.5 nC of charge uniformly distributed throughout the sphere. The magnitude of the electric field at the surface is

A) 1800 N/C.
B) 2600 N/C.
C) 780 N/C.
D) 3800 N/C.