Final answer:
In the event of a severe fire, the most appropriate action is to evacuate the building and contact the fire department. Firefighters are equipped and trained to handle such emergencies.
Step-by-step explanation:
In case of a severe fire, the correct action to take is B. evacuate the building and call the fire department. This is the safest approach since severe fires can escalate quickly, posing a significant threat to life and property. When a fire alarm sounds, there is always an uncertainty over whether there is a serious fire or other hazard awaiting. Firefighters are professionally trained to rescue victims from burning buildings and are equipped with fire-resistant clothing and breathing apparatus to protect themselves from extreme physical danger. They also have the necessary skills to assess fires and situations and have the equipment, such as two-way radios, to report conditions to their superiors. Trying to fight a severe fire on your own without proper training or equipment can be incredibly dangerous. Hence, leaving the building and contacting professionals immediately should be the priority.