Which of the following components is crucial for a fire protection system in transportation equipment?

The fire alarm system is a crucial component for a fire protection system in transportation equipment because it acts as an early warning device that can detect smoke or fire and notify personnel or occupants. This prompt alert is essential for quick evacuation and initiating firefighting measures, which ultimately helps to minimize damage and maintain safety during a fire incident.

While other options, such as fire-resistant materials, can play an important role in preventing the spread of fire, they do not provide the immediate detection and notification that a fire alarm system offers. Reflectors serve a different purpose, primarily aiding visibility, and hydraulic brakes relate to the braking system, not fire protection. Therefore, the inclusion of a fire alarm system is vital in safeguarding lives and property in the event of a fire.