Answer:
B) had been mostly abandoned by Northerners.
Step-by-step explanation:
Following the victory of Republican Ulysses Grant as the President of the United States in 1868 and the belief that the passing of the Thirteenth, Fourteenth, and Fifteenth Amendments had all solved many of the basic issues of reconstruction.
The Northerners, by the early 1870s, began to have a lesser interest in the congressional reconstruction goals of 1866. Their main focus was the issue of corruption economic problems.