The correct answer is D) a person accused of a crime has the right to an attorney.
The American legal practice that did not come from the Roman Law of Nations is "a person accused of a crime has the right to an attorney."
The Roman Law of Nations was a series of traditional laws followed by people in Rome through tradition. The Romans developed this system to be applied in all cases with Roman citizens and foreigners in case of a dispute. So many Europeans nations followed that customary law for their countries and the new territories that were conquered. But the American legal practice that did not come from the Roman Law of Nations is "a person accused of a crime has the right to an attorney."