Which lines from "the courage that my mother had" to convey the poem's mood of sadness and longing?

a.

"oh, if instead she'd left to me / the thing she took into the grave! —"

b.

"rock from new england quarried; / now granite in a granite hill."

c.

"i have no thing i treasure more: / yet, it is something i could spare."

d.

"the courage that my mother had / went with her, and is with her still: "