Although Salt Crystals Are Clear, a Pile of Salt Appears

Although salt crystals are clear, a pile of salt appears to be white. This is because

A) small salt grains can absorb black light, leaving only white light to be reflected.
B) some light is reflected whenever light moves from a salt granule to air or vice versa. The randomly oriented granules reflect light in all directions.
C) small salt grains are more dense than large salt crystals, and they fluoresce white light when exposed to infrared radiation.
D) small salt grains are metallic and act as mirrors, scattering light in all directions.