What emergency equipment must be on board every ambulance?

Answer: B — Oxygen supply, automated external defibrillator (AED), and first aid kit

The presence of an oxygen supply, an automated external defibrillator (AED), and a first aid kit on every ambulance is crucial for providing prompt and effective emergency medical care. An oxygen supply is vital in emergencies where a patient is experiencing respiratory distress, allowing for immediate administration of oxygen to alleviate conditions such as hypoxia. The AED is an essential piece of equipment used in cases of cardiac arrest, enabling responders to quickly and effectively deliver defibrillation to restore a normal heart rhythm. A first aid kit is necessary to handle a variety of situations, from minor injuries to more serious traumas, ensuring that medical personnel can provide basic care until further medical assistance is available. In contrast, the other options listed do not encompass the critical life-saving equipment required for immediate medical response. While items such as fire extinguishers, light flares, and blankets can be useful in certain situations, they do not directly address the urgent medical needs of patients.