The impact of the changing nature of labor and land ownership in the post-civil war?

Following the U.S. Civil War, the Radical Republicans attempted to put a land reform through Congress, promising, 40 acres and a mule, to newly-freed blacks in the South, which was rejected by moderate elements as socialistic. This failure left blacks without an economic base, and was one of the key contributing factors to the development of sharecropping and segregation<

It's most likely choice a, it makes the most sense in my opinion.