The most accurate statement regarding how ethnic mythologies have affected racial relations in the U.S. is:
B. European and Euro American ethnic mythology has been used to justify racial discrimination.
This statement reflects the historical context in which European-centered narratives and ideologies have often been employed to legitimize and reinforce hierarchical racial categorizations and discriminatory practices against various racial and ethnic groups in the U.S. The other options either misrepresent the historical realities or are too broad or inaccurate.