An equal number of eighth-grade students chosen by chance from the athletic teams and school clubs
The ideas which were important was the discrimination and the segregation. This is because the story deals with the narration of the African American family so they are often victim of the discriminatory and the other related practices.
After reading the book, it gave a clear picture of the situation of the African American people living there. It helped in understanding the entire scenario where the practices of discrimination are done against the family.
I'm not sure what the lesson is, but the answer that makes sense the most is number. Number because most lessons in subject-verb agreement concerns the singularity and plurality of the subject at hand
The answer is A<span> innocence</span>