What tension did W. E. B. DuBois bring to light in his writings about the failures of Reconstruction?

ADuBois highlighted how the needs of formerly enslaved African Americans were too great for adequate government intervention or response.

BDuBois highlighted how the tensions between formerly enslaved African Americans and free blacks undermined the success of Reconstruction.

CDuBois highlighted how the interests of poor whites and formerly enslaved African Americans were just too disparate for Reconstruction to be successful.

DDuBois highlighted how economic interests in the north and the south, along with racism, limited Reconstruction.