I need a thorough answer on the evolution of hip hop

Hip-hop began as a DJing form. The genre consisted of electronic music with no vocals. The roots of spoken hip-hop music are African-American music styles such as jazz poetry and spirituals. Hip-hop formed into a musical genre and subculture in the Bronx borough of New York City.

The answer is

1)harmony-a2)balance-e3)asymmetrical balance-b4)abstract-c5)approximate symmetry-d