According to ASRAE Standard 15-2013, room sensors and alarms are required to detect:

The correct answer highlights the requirement set by ASHRAE Standard 15-2013, which mandates that room sensors and alarms must be capable of detecting all refrigerant safety groups. This is crucial for ensuring the safety of spaces where refrigerants are used, as different refrigerants come with varying toxicity and flammability risks.

By detecting all refrigerants, the system can alert individuals to potential leaks or hazards, regardless of the specific type of refrigerant present. This comprehensive approach ensures that safety measures are in place for any refrigerant that may be present in the environment, thereby enhancing overall safety and risk management in areas where refrigeration or air conditioning systems operate.

The other options are limited in scope. Optioning for high-pressure refrigerants alone would not account for other substances that may pose safety risks, and focusing on only flammable refrigerants would also leave out several toxic or harmful refrigerants that need monitoring. Therefore, the requirement to detect all refrigerant safety groups captures a full spectrum of potential hazards, aligning with best practices in safety management.