What can increase your visibility to other drivers on a motorcycle?

Answer: C — Wearing reflective clothing

Wearing reflective clothing significantly enhances your visibility to other drivers while riding a motorcycle. Reflective materials work by bouncing light back towards its source, making you much more noticeable, especially in low-light or nighttime conditions. This increases the likelihood that other drivers will see you, thereby reducing the risk of accidents. To understand why the other options are less effective: wearing dark clothing can actually decrease your visibility, particularly at night or in dimly lit conditions. Riding in a straight line is more about control and safety than visibility, as it does not significantly contribute to being seen by others. Similarly, while using a loud exhaust system may alert other drivers to your presence, it does not improve visibility in the same way that reflective clothing does. Thus, wearing reflective clothing is the most effective way to enhance visibility on the road.