Why Are Dark Dust Clouds Largely Misnamed

Why are dark dust clouds largely misnamed?

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