Which unit was assigned to assist the medical group during the incident?

The correct choice indicates that Engine 4 (E4) was designated to assist the medical group during the incident. This can be understood within the context of a firefighting and emergency response scenario where different units are tasked with specific roles based on their capabilities.

Engine companies like E4 typically have firefighters trained in medical response and basic life support. They carry medical equipment and can provide on-scene medical assistance until more advanced medical units, such as ambulances, arrive. In situations where medical emergencies are prevalent, having an engine company assist the medical group ensures that immediate support is available, thereby enhancing the effectiveness and speed of the emergency response.

Other units, like aerials or rescue units, carry specialized tools suited for different types of emergencies, such as extrications or aerial support, but may not have the same level of training or equipment specifically geared towards medical aid as an engine company would. Thus, E4’s assignment aligns perfectly with the need for immediate medical assistance at the incident scene.