Newsela - story "All-Black towns across America: Life was hard but full of promise" Why does the author include the opinions of Norman L. Crockett and Susan Pearl?

A
to present the perspectives of experts who specialized in the history of the all-Black town Nicodemus
B
to present competing perspectives about when the all-Black town idea reached its height
C
to highlight the perspectives of settlers who moved to all-Black communities after the Civil War
D
to highlight the perspectives of experts regarding the period when all-Black towns proliferated