The correct answer is B) the Southern States have been conquered and should be punished by their actions.
The statement that best describes the attitude of the radical Republicans following the Civil War is "the Southern States have been conquered and should be punished by their actions."
Radical Republicans in Congress did not agree with President Lincoln's plans to reunite the country as quickly as possible. President Abraham Lincoln wanted a quickly Reconstruction process and gave leeway to the Southern states to do their own Reconstruction process and only demanded the application of the 10th percent Plan, issued on December 8, 1863.
The other options of the question were A) the Southern States should pass the black codes. C) former Confederated leaders should be forgiven for their actions during the Civil War. D) the country should follow President Lincoln's plans to reunite the country as quickly as possible.