The Traditional Monolithic Collapse Theory for the Formation of the Milky

The traditional monolithic collapse theory for the formation of the Milky Way Galaxy suggests that our galaxy formed

A) as material accreted around a massive black hole currently at the center of our galaxy.
B) from a large cloud of material that formed stars and star clusters and slowly flattened to a disk.
C) from material that had been ejected in the violent explosion of a dying galaxy.
D) as a result of mergers between several smaller groups of gas,dust,and stars.
E) as two massive galaxies collided.