What are the primary components of the fire detection system in the CRJ?

The primary components of the fire detection system in the CRJ include smoke detectors and fire warning indicators, which are specifically designed to identify the presence of fire or smoke in the aircraft. Smoke detectors are critical in providing early warning of smoke presence, allowing the crew to react quickly to potential fire situations. Fire warning indicators complement this system by alerting the flight crew to the specific area where a potential fire may be occurring, ensuring a prompt and informed response.

In contrast, the other options incorporate elements that are not part of the fire detection system. Heat sensors and carbon monoxide detectors, while important for safety, do not specifically cover the fire detection system's primary function. Emergency lighting and exit signs are essential for evacuation but serve a different purpose. Alarm systems and communication devices are critical for overall safety and emergency response but do not specifically pertain to the fire detection system itself. Thus, option A encapsulates the essential components of fire detection in the CRJ effectively.