4. Which of the following is NOT a reason why ethnicity remains a source of controversy in the United States? A) Disagreement regarding the extent of discrimination minority ethnicities such as African Americans and Hispanics still endure. B) Disagreement on the extent that minorities should receive preferences in hiring and university admissions to correct past patterns of discrimination. C) Controversial debates over whether people should identify their ethnicity on the census. D) Different understandings of the extent to which the distinct cultural identity of ethnicities should be encouraged or protected. E) Disagreement over whether or not ethnicity is really different from race.