I disagree. I believe it is:
D. Radical Republicans
Radical Republicans during and after the civil war were staunch progressives, supporting abolition and the rights of African Americans. In this political cartoon, the former confederates who gained pardon through legal policy are contrasted with the African American veteran who stands stoically despite his injuries from combat. The cartoon questions if you would “pardon” these undeserving southern men, why not “franchise” the loyal and noble black citizen?