In addition to B)

You can still have planet, dead suns and other stellar objects in a galaxy, as long it has a stable orbit.

But like other mentioned, hawking radiation is a topic. When background radiation will be smaller then hawking radiation from a big black holes, it loses energy = mass. Because it loses mass, the orbit from all objects around will increase. So in a long long long future it could be, that galaxies disband and only some single solar systems with dead suns exists...