What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?

Question

Quizplus · Accepted Answer

The high orbital speeds of stars far from the galactic center suggest the presence of additional mass that is not accounted for by the visible matter, which is a characteristic of dark matter.

Answer: C 
 Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk, which implies the existence of a large amount of dark matter.

Answer: B and D are not correct. Although dark matter emits no visible light, it does not emit radio emissions either, nor does it cause dark blotches that obscure our view of distant galaxies.

What Evidence Suggests That Most of the Mass of the Milky