Here are the answers to your questions:
Question 1: The demographic shift that caused the African American population of Harlem to grow rapidly in the early 1920s was the D) Great Migration.
Question 2: The person who wrote "Their Eyes Were Watching God," usually considered that person's finest work, is D) Zora Neale Hurston.
Question 3: Billie Holiday was famous for her accomplishments in B) jazz.