Why Are Dark Dust Clouds Largely Misnamed

Why are dark dust clouds largely misnamed?

A) The cloud is an illusion, for the dust is evenly distributed around the Galaxy.
B) Dust clouds do radiate energy, but not as much light as the stars do.
C) It is ice, not dust, which make them look dark.
D) They contain much more gas than dust.
E) All of the above are correct.