Which one does not refer to Hope?

“Hope” is the thing with feathers

by Emily Dickinson

“Hope” is (a) the thing with feathers

That perches in the soul,

And sings the tune without the words,

And never stops at all,

And sweetest in the gale is heard;

And sore must be the storm

That could abash (b) the little bird

That kept so many warm.

I've heard (c) it in the chillest land,

And on the strangest sea;

Yet, never, in extremity,

(d) It asked a crumb of me.

Of the underlined (a) through (d), which one could possibly not refer to "Hope"?

(I wonder if there's any...)

Thank you so much.