A good bus driver is one who drives...?
Answer: B — defensively
A and C are incorrect because driving quickly or taking the shortest route can be dangerous and put passengers at risk. D is incorrect because driving with the windows open can be distracting and uncomfortable for passengers. Option B, driving defensively, ensures safety for passengers and other drivers on the road. This includes following traffic laws, being alert and aware of one's surroundings, and reacting appropriately to potential hazards.