The party that opposed the Dred Scott decision by the Supreme Court was the Republican Party.
This was a decision by the Supreme Court where the Court judged that Black people were not to be American citizens because they were property at the time.
The Republican party opposed this decision as they were anti-slavery. They said that the Constitution allowed for Black people to be free and to be citizens.
In conclusion, option D is correct.
Find out more on the Dred Scott decision at https://brainly.com/question/315266.
