The action of the speaker that can be considered ironic is that actually the speaker takes initiative of establishing the wall up to himself but then he questions it and has some doubts about that. There is another irony, I would say, the main one, you may find it useful : the wall which was meant to separate neighbours brings them together every year in order to repair it. Is it really the borderline?Hope that helps.
(I think I know which poem you are talking about, because I had this on quizizz. If it's not the correct poem, I'm sorryyyy.)
Answer:
<em>"The color of your skin doesn't determine whether or not you're American."</em>
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C is the answer for your question
I can write a paragraph about Martin Luther King
C. and D. should be your answers. If not, its A. and B.
Hope this was helpful...