hard working

• A. Lazy
• B. Lax
• C. Diligent
• D. Tireless

Answer: (C)

Hard-working describes someone who puts in a lot of effort and stays committed to getting tasks done. The word that best fits this sense is diligent, which means showing steady, careful, and thorough work. A diligent person pays attention to details and remains consistent in putting in effort, making it the closest synonym to the idea conveyed by "hard-working."

Lazy is the opposite, implying a reluctance to work. Lax suggests carelessness or a lack of strictness, not the amount of effort someone exerts. Tireless conveys endless energy and persistence, which is related but focuses more on stamina than the careful, meticulous effort often implied by hard-working.