I THINK, technically speaking, that the answer you're looking for is:
Option B: <span>a contrast between what is expected to happen and what actually happens
However, irony itself can be particularly difficult to accurately define, so I would recommend taking the technical definition (Option B) at face value, and accepting that there's a bit more to it.
Hope I could help, let me know if I was correct or not!
</span>
Answer:
A mutual relationship
Explanation:
The bird helps the cow by getting the tick off, and by doing so, it helps the bird as well because the bird gets a snack while doing so. Hope this helps :3
