What Observed Feature of the Milky Way Is Better Explained

What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?

A) The elongated shape of the central bulge of the galaxy
B) The different metallicities of the bulge and disk of the galaxy
C) The difference in age of globular clusters
D) The supermassive black hole found at center of the galaxy
E) The very little gas or dust that halo contains

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