Answer choices:
A. The nature-loving persona wants to meet the narrow fellow in the grass but never has.
B. The narrow fellow in the grass is a figment of the persona's imagination.
C. In the presence of the narrow fellow in the grass, the persona feels comfortable.
D. Though usually comfortable outdoors, the persona is fearful of the narrow fellow.
The answer is D because, in the two final stanzas in the poem, Emily Dickinson is describing how she knows the several of nature's people, but not the narrow fellow in the grass and how her breathing got tighter. The last line that says, "And Zero at the Bone" is another way of saying that the fellow in the grass gave her chills to the bone, almost as if she saw a ghost. I hope this helped! :)