Final answer:
The major cause of death in refrigerant accidents is inhalation of refrigerant vapors, which can lead to suffocation due to oxygen displacement, especially in poorly ventilated areas.
Step-by-step explanation:
In refrigerant accidents where death occurs, the major cause is a) inhalation of refrigerant vapors. Exposure to refrigerants can lead to suffocation due to oxygen displacement, particularly in settings with poor ventilation. Similar to accidents with gas heaters or pesticide exposures, inhalation poses significant dangers. These substances can displace air in poorly ventilated spaces, leading to asphyxiation, which is the primary danger rather than chemical burns or lack of personal protective equipment (PPE). Usage of PPE and proper ventilation are critical in preventing these tragic events.