Which was NOT a reason the North began to lose interest in the Southern Reconstruction by the early 1870s?

ASouthern intransigence was increasingly frustrating to the North, whose soldiers had fought for blacks' freedom.

BThe violence in the South was increasingly disturbing and seemed to indicate that blacks would never really be free.

COther issues, such as Indian Wars, western expansion, and others started to overtake Northerners' attention.

DReal and propagandized evidence of corruption in the reconstructed Southern governments discouraged the North.