As soon as bad weather is encountered, you should...?

Answer: C — Slow down

When encountering bad weather, slowing down is crucial for maintaining control of your vehicle and ensuring safety. Reduced visibility, slippery roads, and changing traction conditions can significantly affect how your vehicle handles. By driving at a slower speed, you can react more effectively to sudden changes, such as obstacles or the behavior of other drivers, giving you more time to make safe decisions. It also helps prevent skidding or hydroplaning, which can occur on wet or icy surfaces. Thus, adjusting your speed to match the adverse conditions is a key element of safe driving during inclement weather.