Dust Grains Released by the Melting of Ice in a Comet

Dust grains released by the melting of ice in a comet nucleus:

A) drift away from the Sun along magnetic field lines, outlining the structure of the field.
B) become a straight, highly structured, and very variable tail blown away from the comet by the solar wind.
C) become a cloud around the nucleus, the coma, scattering sunlight very efficiently at blue wavelengths.
D) become a uniform, curved tail moving away from the comet under radiation pressure from sunlight.