What Eventually Halts the Gravitational Collapse of an Interstellar Gas

Multiple Choice

What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is not massive enough to become a star?

A) the central object becoming hot enough to sustain nuclear fusion in its core
B) A critical fraction of the gas has been driven further into space.
C) the crowding of electrons in the core
D) Nothing; all collapsing gas clouds become black holes.