In Reference to Black Holes,a Singularity Is

Multiple Choice

In reference to black holes,a singularity is

A) the name given to a hot spot emitting X -ays just beyond the event horizon.
B) a place just outside the event horizon of a rotating black hole,where it is impossible to remain at rest.
C) a place where a nonzero mass occupies zero volume.
D) a place where the escape velocity equals the speed of light.