What should optional safety equipment include aside from emergency phone numbers and tire chains?

Answer: C — Tire changing equipment

Optional safety equipment should incorporate items that enhance safety and preparedness for unexpected situations while driving. Among these, tire changing equipment is particularly important because it allows a driver to safely address tire issues on the road. Being able to change a tire minimizes downtime during a journey and enhances the vehicle's reliability. While extra fuel, traffic cones, and a first aid kit are also valuable for various reasons, their relevance as optional safety equipment can vary depending on the situation. For instance, while extra fuel might be helpful in remote areas, it also comes with risks of spillage and fire hazards if not stored properly. Traffic cones are useful for signaling purposes and creating safe zones, but they might not be practical or necessary in all situations. A first aid kit is critical for addressing medical emergencies but, like the other items, its necessity may differ based on the nature of the trip and the regions traversed. However, having tire changing equipment directly contributes to the safety and efficiency of roadside repairs, making it a crucial consideration for any commercial driver.