How Do Absorption Lines from Interstellar Gas Compare to Absorption

Multiple Choice

How do absorption lines from interstellar gas compare to absorption lines from stars?

A) They are wider than the lines from stars because the gas is hotter than most stars.
B) They are narrower than the lines from stars because the gas has a lower pressure than stars.
C) They indicate that the interstellar medium contains different elements than stars do.
D) They indicate that interstellar medium clouds have high velocities.