What is the evidence that the Milky Way must have formed when the gas within a huge "clump" of dark matter collapsed?

Question

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The formation of the Milky Way galaxy is thought to be linked to the collapse of a huge "clump" of dark matter, which provided the gravitational attraction necessary to pull in gas and form stars. The evidence for this scenario comes from several sources, including the number and distribution of nearby dwarf galaxies (A), the properties of globular clusters (B), and the presence of a supermassive black hole at the center of the Milky Way (C). Together, these lines of evidence suggest that the Milky Way formed from the collapse of a massive cloud of dark matter and gas billions of years ago.

What Is the Evidence That the Milky Way Must Have