Answer:
D. Playful
Step-by-step explanation:
These lines are the ones that describe the moment that the raven steps into the room. Although the mood so far has been one of formality, we see that this tone changes when the raven enters. The author describes the raven as making "many a flirt and flutter." This describes the playful way in which birds move, changing the tone of the poem to a more relaxed and positive one.