Which option best defines conscientious?

• A. working hard and careful to do things well
• B. careless
• C. loud
• D. timid

Answer: (A)

Conscientious describes someone who is diligent, meticulous, and careful to do things well. It involves taking responsibility, paying attention to detail, and striving for accuracy and quality in tasks. The option that says someone works hard and is careful to do things well captures that sense best, conveying both effort and carefulness in completing work. The other descriptors point to different traits—careless means not paying attention and can lead to mistakes, while loud and timid describe temperament or how someone expresses themselves, not their level of diligence. So, the choice that emphasizes hard work and carefulness is the best fit for conscientious.