Which of these stanzas from “the raven” by edgar allan poe addresses the theme of everlasting love?

a) but the raven, sitting lonely on that placid bust, spoke only
that one word, as if its soul in that one word he did outpour
nothing farther then he uttered; not a feather then he fluttered—
till i scarcely more than muttered: "other friends have flown before—
on the morrow he will leave me, as my hopes have flown before."
then the bird said "nevermore."


b) but the raven still beguiling all my sad soul into smiling,
straight i wheeled a cushioned seat in front of bird and bust and door;
then, upon the velvet sinking, i betook myself to linking
fancy unto fancy, thinking what this ominous bird of yore—
what this grim, ungainly, ghastly, gaunt, and ominous bird of yore
meant in croaking "nevermore."


c) "prophet! " said i, "thing of evil! —prophet still, if bird or devil!
by that heaven that bends above us—by that god we both adore—
tell this soul with sorrow laden if, within the distant aidenn,
it shall clasp a sainted maiden whom the angels name lenore—
clasp a rare and radiant maiden whom the angels name lenore."
quoth the raven, "nevermore."


d) and the silken sad uncertain rustling of each purple curtain
thrilled me—filled me with fantastic terrors never felt before;
so that now, to still the beating of my heart, i stood repeating
"'tis some visiter entreating entrance at my chamber door—
some late visiter entreating entrance at my chamber door;
this it is and nothing more."