Final answer:
The central idea of the article is the return of a doctor to his hometown to provide care.
Step-by-step explanation:
The central idea of the article "Healing 'Brick City': A Newark Doctor Returns Home" is d) A doctor's return to his hometown to provide care. The article focuses on the story of a doctor who comes back to Newark, New Jersey, where he grew up, to offer medical assistance to his community. It highlights the challenges he faces and the impact of his return on the city.