What Prevents a Neutron Star from Collapsing and Becoming a Black

What prevents a neutron star from collapsing and becoming a black hole?

A) Gravity in the neutron star is balanced by an outward force due to neutron degeneracy.
B) Gravity is balanced in neutron stars by the outward centrifugal force produced by their rapid rotation.
C) Gravity in the neutron star is balanced by an outward force due to gas pressure, as in the Sun.
D) Neutron stars are solid, and, like any solid sphere, they are held up by the repulsive forces between atoms in the solid matter.