Concept:The word "strive" means to make a strong effort to achieve a goal.Explanation:"Strive" is closest in meaning to "endeavour," which also means to try hard to do or accomplish something."Work" may involve effort, but it is broader and does not match the exact sense of persistent struggle."Steal" and "endure" have completely different meanings, so they cannot replace "strive."Therefore, the best synonym is "endeavour."Answer:C. endeavour