The answer is number 3, "We are met on a great battle-field of that war."
The meaning of the title Cold Equations is directed towards people who don't get along very well and have different points of views. Take a magnet for example: Some poles attract, others repel. Be confident! I believe in you! You've got this! Hope this helps!
The finishing point constructed by Twain is: when the old man is about to finish the story of Jim Smiley's jumping frog, another individual interrupts him. The narrator tries to leave the place, but the old man reaches it. The story ends with the old man who starts telling the narrator about a yellow cow with only one eye of Jim Smiley.
I would say that the answer is probably 3. Hope this helped!
-TTL