Final answer:
c. an open country road. High beams are intended for use on open country roads, providing better visibility in low-light conditions. They should be switched to low beams when around other vehicles to prevent dazzling other drivers and are not suitable for heavy traffic or well-lit urban areas.
Step-by-step explanation:
High beams are used for c. an open country road. High beams are a feature on cars that provide brighter and longer-range illumination than regular headlights. They are useful for improving visibility in areas where there is little to no external lighting, such as on open country roads at night. However, it's important to switch to low beams when approaching other vehicles to avoid blinding other drivers. It's not recommended to use high beams in heavy traffic, when driving in snow, or in areas with ample street lighting, such as tall buildings.