A planetary nebula is a(n) ____.
A) expanding envelope of ionized gas expelled by a dying medium-mass star
B) expanding envelope of neutral gas and dust expelled by a dying medium-mass star
C) contracting envelope of dusty material from planets destroyed by a dying medium-mass star
D) contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star
E) expanding atmosphere of a medium-mass star as it becomes a red giant
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