Answer: “Tony cooked dinner and I made the salad, but Mike just ate.”
NOTE: The third option is 100% incorrect, but from the other two, it is quite confusing. Option 1 applies more to a compound sentence, but it can be Option 2 as well, because it makes sense too.
It was very big and could be seen just by walking down the streets, You said which statment explains the irony of it, but you didn't give me multiple choice, so this is all I could answer to