What Is the Expected Future of Our Galaxy

What is the expected future of our galaxy?

A) Its contents will eventually be pulled in by the supermassive black hole at its center, Sagittarius A*.
B) Eventually all its matter will be in the form of iron atoms.
C) It will eventually be made of nothing but white dwarfs, neutron stars, and black holes, and then will collapse in on itself in a Big Crunch.
D) It will merge with nearby galaxies and then eventually decay into photons.
E) It will expand with the universe, but will stop expanding once enough stars become black holes.