When inspecting your bus, what must be ensured?

The correct answer indicates that a comprehensive inspection of the bus involves checking every critical safety feature and equipment to ensure the vehicle is fit for operation. This thorough approach is crucial because it addresses various aspects of passenger safety and operational readiness.

When inspecting a bus, it's important to ensure that every handhold and railing is secure. These elements are vital for passenger safety, as they provide stability and support for individuals while boarding and during transit. Additionally, ensuring that rider signaling devices are operational is essential for allowing passengers to communicate their need to stop, contributing to a safe and efficient travel experience.

Emergency exit handles must also be secure. In case of an emergency, it is critical that these exits function properly, allowing passengers to evacuate quickly and safely.

Thus, option C embodies the principle of holistic safety checks, confirming that all mentioned components—handholds, signaling devices, and emergency exits—are thoroughly inspected to provide the highest level of safety for passengers. This approach not only complies with regulations but also promotes best practices for operating a passenger bus efficiently and safely.