In the dred scott case, the supreme court decided a. the missouri compromise was illegal because it was illegal for congress to deprive a slave owner of property (slaves) without the due process of law. b. the compromise of 1850 was illegal because it was illegal for congress to deprive a slave owner of property (slaves) without the due process of law. c. the missouri compromise was illegal because it was illegal for congress to deprive a slave of his or her freedom if they lived in the south. d. the missouri compromise was illegal because it freed slaves in the slave states