You didn't provide any choices. But it was a literary technique first used by William James. People like Gertrude Stein used it in her work.
Answer: "Sometimes at dusk we would see him come out from the hidden interior of his island. For years we had no idea who he was or what he did until"
Suddenly at dusk we heard a cry for help. The man who knew we were watching him and wanted nothing to do with us was crying for help.
For a moment we stood still thinking to ourselves who's voice is that? Then suddenly we realized could that be the mysterious man?? We then looked at each other and rushed towards the island raring to see what had happened. As we got closer to the island the screaming got louder and louder. Then finally it stopped as we saw a fragile old man who had fallen.
We then helped him back to his hidden interior and nursed him back to health. We soon after became great friends with him as that very night we saved his life.
Explanation:
I think the dominant irony presented in the passage would be :
The Houyhnhnms. the most rational beings on earth, are discussing the extermination of an entire group of creatures.
You can see that in this sentence, the second part of the statement contradict the statement on the first part.