There Is a Hollow, Conducting, Uncharged Sphere with a Negative

There is a hollow, conducting, uncharged sphere with a negative charge inside the sphere. Consider the electrical potential at the inner and outer surfaces of the sphere. Which of the following is true?

A) The potentials on both surfaces are equal but not zero.
B) The potentials on both surfaces are zero.
C) The potential on the inner surface is greater.
D) The potential on the outer surface is greater.