The correct option is B African Americans' migration to industrial cities led to "white flight."
The Gilded Age” is the term used to describe the tumultuous years between the Civil War and the turn of the twentieth century. The Gilded Age was an era that occurred during the late 19th century, from the 1870s to about 1900. It was an era of rapid economic growth, especially in the Northern United States and the Western United States. African Americans' migration to industrial cities led to "white flight." is not associated with Gilded age.