The Traditional Theory States That the Galaxy Formed

The traditional theory states that the galaxy formed

A) as a large spherical cloud of gas that was rotating very slowly.
B) from a large cloud of material that broke off a larger galaxy.
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.