Suppose You Read Somewhere That 10 Percent of the Matter

Suppose you read somewhere that 10 percent of the matter in the Milky Way is in the form of dust grains. Should you be surprised? If so, why?

A) There is nothing surprising about 10 percent figure s because dust grains are the material from which stars are born.
B) Given how easily dust grains can form, 10 percent is a surprisingly low fraction.
C) The fraction of 10 percent is surprisingly high because dust grains can form only at low temperatures.
D) The fraction of 10 percent cannot be correct. Dust grains are solid and only 2 percent of the matter in the galaxy is made of anything besides hydrogen and helium.