Answer:
What we can notice about the structure is:
A. Alternating lines are about the same length and all end with a dash.
Explanation:
"Hope is the Thing with Feathers" is a poem by Emily Dickinson.
Dickinson uses dashes as punctuation with the purpose of breaking the flow, modifying it. We can see that all four lines end with a dash instead of a period, a comma, or any other sort of punctuation.
We can also notice that the alternating lines are about the same length. That is, lines 1 and 3 are similar, and so are lines 2 and 4. Let's put them together to better visualize it:
1 “Hope” is the thing with feathers —
3 And sings the tune without the words —
2 That perches in the soul —
4 And never stops — at all —