The Presence of Dwarf Galaxies in Orbit Around the Milky

The presence of dwarf galaxies in orbit around the Milky Way supports what picture of our galaxy's formation?

A) The galaxy formed through the merger of two large galaxies, which scattered their dwarf companions across large distances.
B) The galaxy originally formed with no dark matter but gained its dark matter through the absorption of smaller dwarf systems.
C) The galaxy formed in a giant explosion caused by the violent collisions of clouds of dark matter.
D) The galaxy formed a long time ago and has been passively evolving since.
E) The galaxy was formed by the merger of smaller protogalactic clumps.