“Alfred Sewell ended his discussion of Chicago with a stirring prediction: ‘The city will nevertheless rise again, nay, is already rising, like the Phoenix, from her ashes. And she will, we believe, be a better city as well as a greater one, than she was before her disaster.’”
This is the best option because it gives the feeling of hope. The image of the Phoenix rising out of the ashes is meant to show that Chicago will once rise again. It will come back and be even better. The quote says that the city will "rise again" and "is already rising". Two of the other options only speak of the devastation of the fire. The option about the workers tells about the demand for laborers but it doesn't necessarily evoke a sense of hope in rebuilding.
