The correct answer is: d. republicans disagreed with President Johnson's reconstruction plan.
After Lincoln's assassination, President Andrew Johnson's approach to Reconstruction was seen as too lenient towards the South, particularly by the Radical Republicans in Congress. They believed that Johnson's policies did not do enough to protect the rights of freed slaves and that they failed to adequately address the needs for a more stringent reconstruction process in the Southern states. This disagreement ultimately led to significant conflict between Johnson and Congress.