Final answer:
The patient with visible burns on the face and neck should be assessed first in the Emergency Department (ED) after an explosion at an apartment complex.
Step-by-step explanation:
The patient who should be assessed first in the Emergency Department (ED) after an explosion at an apartment complex is the patient with visible burns on the face and neck. Burns are a serious injury that can lead to a massive loss of fluid, dehydration, electrolyte imbalance, and circulatory failure. Burned skin is also extremely susceptible to infection. Therefore, immediate assessment and treatment are crucial to prevent further complications and ensure the patient's safety.