What Is the Monolithic Collapse Hypothesis Unable to Explain

What is the monolithic collapse hypothesis unable to explain?

A) The randomly oriented, elongated orbits of stars in the bulge and halo
B) The circular motion of stars in the galactic disk
C) The difference in metallicity between the spherical component and the disk component of the galaxy
D) The elongated bar shape of the central bulge
E) The low density of material in the halo, compared to the central bulge

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