An Object Is Located Inside a Thin, Uniform Density Spherical

Multiple Choice

An object is located inside a thin, uniform density spherical shell. At what locations would the object not be subject to a net gravitational force?

A) only against the inside boundary of the shell
B) only at locations on a sphere that is one-half the inside radius of the shell
C) anywhere within the shell
D) only at locations on a sphere that is one-half the mean radius of the shell
E) only at the center of the shell