For what semester? And what grade?
The effect that this response has on the speaker is that the speaker’s mental state shifts more and more toward madness.
The raven is constantly repeating the same word - nevermore. In the beginning, the narrator just thought it was a weird coincidence that the bird should say that one single word, but as time passes by, the weight of that word becomes unbearable as the narrator realizes that this word can be applied to all of his questions. So as time goes by, the narrator becomes more and more depressed about not being allowed to see his beloved and thus he falls into madness.
Having read the excerpt, the answer to the question is letter b. Millay finds beauty in the autumn world but resents the rebirth of spring because she sees death and sorrow everywhere. The other choices given were not that relevant compared to what is chosen.