An Important Transformation in American Culture Signified by the Emergence

An important transformation in American culture signified by the emergence of swing was that

A) black musicians gained widespread popularity among white audiences for the first time.
B) white musicians consciously emulated black artists for the first time.
C) young people emerged as the deciders of the nation's musical tastes for the first time.
D) black musicians created a nationwide yet racially inclusive musical genre for the first time.