The basis for the imagery used in the underlined selections is: "the supernatural" (Option D) The textual evidence for this is found in the last line.
Imagery is the intentional use of words to communicate to the reader an image that captures accurately the thought of the author.
In this excerpt, the author describes Lady Shalott in a form as though it was a ghost. We can infer this from the last line which indicates that she was dying or going to another place.
"They heard her singing her last song"
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