Answer: D) It produces shivers down the spine, or a feeling of unease.
Explanation: The tone of a text or sentence is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones, like: positive, negative, objective, sad, angry, etc. In the given excerpt from "The Adventure of the Mysterious Picture" the tone used to describe how the speaker is distressed and afraid of the picture produces a feeling of unease on the reader.
