Actually the answer is:
D) a very massive main-sequence star.
The source that stops the crush of gravity in a main-sequence star is outward thermal pressure from nuclear fusion inside the core, not degeneracy pressure.
Both brown and white dwarfs are supported by electron degeneracy pressure and a neutron star is supported by neutron degeneracy pressure. As for the central core of the Sun, after hydrogen fusion ceases, it will reach the state of electron degeneracy by the time it's hot enough to fuse helium.
Astronomy Today / Chaisson, McMillan