Question

careless has the same or almost the same meaning as
incredulous
negligent
clueless
harmless

Explanation:

"Careless" means not giving enough attention to what one is doing, which can lead to mistakes. "Negligent" also means failing to take proper care over something, showing a lack of attention or care. So, they have similar meanings. "Incredulous" means not believing something. "Clueless" means having no idea or being ignorant. "Harmless" means not causing harm.

Answer:

B. negligent