The statement that best describes the role of scientific racism in Nazi persecution is:
Scientific racism was used to construct a theoretically superior Aryan race and to justify racism against other supposedly inferior races.
This accurately captures how the Nazis utilized concepts of scientific racism to promote their ideology of racial superiority, particularly the idea of an "Aryan" race, while dehumanizing and justifying violence against various marginalized groups, including Jews, Romani people, disabled individuals, and others deemed "inferior."