The correct answer is C) To punish the South.
One goal of the Radical Republicans Reconstruction plan was to punish the South.
This group of Radical Republicans in Congress supported a much harsher reconstruction plan in the South was Radical Republicans.
After the Civil War, Lincoln supported a mild Reconstruction of the South. But not everyone agreed with this mild plan, some groups and voices disagreed and preferred a much harsher plan of Reconstruction in the former Confederate states. They were the Radical Republicans. Republicans in the Senate and the House of Representatives considered that the Southern states deserve a harsher plan for all the damaged they had caused with the Civil War.