Answer: A) The author's use of the phrase "I walk in loneliness" gives the passage a sad and isolated tone.
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. From the given options, the one that describe how the author's word choice contributes to the tone of the passage, is the corresponding to option A: The author's use of the phrase "I walk in loneliness" gives the passage a sad and isolated tone.