What should you do if your windshield wipers fail in rain or snow?

Answer: C — Stick your head out the side window to see as you leave the roadway

The situation of windshield wipers failing during rain or snow can create a hazardous driving condition. The correct response would involve pulling over immediately and waiting for the weather to improve or for assistance. This choice is based on the priority of ensuring safety; operating a vehicle without adequate visibility poses significant danger not only for the driver but also for other road users. Using the defroster is important in other scenarios, particularly for preventing fogging or ice accumulation, but it would not address the lack of wiper function in a rain or snow scenario. Speeding up to reduce rain impact could lead to loss of control and increasing risk, while sticking one's head out to see is not only impractical but extremely dangerous, potentially impeding the ability to steer and maintain safe control of the vehicle. In summary, the appropriate action in the event of wiper failure during adverse weather is to stop safely, ensuring both personal safety and that of others on the road.