Explanation:

- Endeavour: It means trying hard to do or achieve something. It's about making an effort or attempt.

- Option 1, Success: This implies achieving a desired outcome, not the effort itself.

- Option 2, Result: This is the effect or outcome, not the action or effort.

- Option 3, Achievement: This is about completing something successfully, again focusing on the outcome rather than the effort.

- Option 4, Attempt: This is the act of trying or making an effort, which closely aligns with "endeavour."

- Correct Answer: Option 4, Attempt