How Does the Dust Tail of a Comet Compare with Its

How does the dust tail of a comet compare with its gas tail?

A) Dust tails often appear blue and gas tails white.
B) Dust tails are straight, whereas gas tails are curved.
C) Dust tails are more massive than gas tails.
D) Dust tails point toward the Ssun, whereas gas tails point away.