D). It provided a high-quality education to African American students.
Explanation:
As per the question, Dunbar is characterized as a remarkable school as 'it provided a high-quality education to African American students' which proved quite significant for them. It is recognized as America's first black school(established in 1870) which was a landmark in beginning of the black education. It educated the African Americans to break away from the racist stereotypes and segregation laws and gave them an opportunity to shine. Therefore, <u>option D</u> is the correct answer.
