Final answer:
The statement that best reflects the reversal of the Dred Scott decision is the one about the ratification of the Fourteenth Amendment, providing equal protection to all citizens.
Step-by-step explanation:
The statement that reflects the reversal of the Dred Scott decision, which ruled that slaves were property and not people, is: "Radical Northern Republicans who advocated for a more equal society pushed their agenda forward as well, leading to the ratification of the Fourteenth Amendment, which gave all citizens equal protections under the law." This statement describes the action taken to undo the Dred Scott decision’s implications, specifically the ratification of the Fourteenth Amendment which guaranteed equal protection for all citizens, effectively countering the ruling that African Americans could not be citizens.