Is there a passage or something that goes with this? Please be clear next time I wish I can help but you have to be more clear about the question.
The purpose of citing textual evidence in a literary analysis essay is to let the readers know that the particular text is cited from a different source and see the end part of the paper for the full source of citation and ideas that you applied in your essay.
A. To create personification with the mountains.
B. To create a frightening or mysterious tone.
Personification, because of the "golden slumbers kiss your eyes"
personification is when you give something human attributes that otherwise does not have human attributes, in this case the "slumbers"