unlike The Radical Republicans who ran Congress during Reconstruction the moderate Republicans

The correct answer is D. Believed that too much change would create more conflict.
During the Reconstruction stage after the Civil War in the United States, the radical republicans were a majority sector characterized by considering punishing the Southern States for their extreme rebellion. They also intended to impose several radical reforms on the former slaves. On the other hand, moderate Republicans considered that reforms that cause great changes in society should not be implemented, because they considered that this could bring more conflicts. An example of this was when the radical faction wanted to force the southern states to grant citizenship to African Americans, while the moderate faction did not think the same. This caused Congress (with a radical majority) to pass the Thirteenth, Fourteenth and Fifteenth Amendments implementing major structural changes in society despite opposition from the moderate faction. According to the above, the correct answer is D. Believed that too much change would create more conflict.