Well, it's not the Ku Klux Klan, as that was a large group of people who wanted to have slaves all return to their work, I've never heard of C, and we barely touched on D in school. From what I've learned, however, the Freedmen's Bureau helped former slaves by supplying food, providing education and homes, etc.
The benefits were jobs, since the factories moved to cities and needed more workers the urbanization began thus creating a high demand for labor
I say A) Economic Decline
Answer:
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It was tragedy and comedy to show life can be serious and it can be fun