Yet deeper than character, or even place, is another concept: voice. more than any other doorway to the imagination, i find this one the trickiest to open—and the hardest to close. for a character's true voice is heard, its tones, cadences, and ideas are long remembered. the ancients [people from ancient history] used anima, in fact, to describe breath as well as soul. that is wholly appropriate, for in the breath—the voice—of a character lies its essential spirit. if the writer can truly hear the voice of a character, so will the reader. what does the author explicitly say can be found in the voice of a character? doorways place ancients spirit

Based on Thoreau's beliefs, the best option seems to be letter D. could imprison him but could never confine his soul.

Explanation:

Henry David Thoreau was a famous writer who was part of the transcendentalist movement that began in the early 19th century. Along with other writers and philosophers, Thoreau was greatly influenced by Eastern religious texts. They believed in independence of spirit and thought, as well as in the power of intuition over logic. According to transcendentalist beliefs, God inhabits each person. Thus, everyone has the necessary knowledge and consciousness to guide his/her behavior.

When Thoreau talks of his body in comparison to a boy's dog, he means his body is being punished instead of his soul just like the dog is being punished instead of his owner. In other words, Thoreau separates his notions of soul and body in the sense that they are not the same, nor does the imprisonment of one means shackles for the other. The state can arrest him, prevent his body from moving freely. But his soul can wander, his mind is his own to think and believe without restraint.