Aresult of jazz’s development during the 1920s and 1930s was that many people began performing spirituals. claimed credit for jazz. rejected the ragtime sound. embraced jazz music.

A result of Jazz's development during the 1920s and the 1930s was that many people embraced jazz music. Option D is correct.

It is believed that African American musicians were the founders of Jazz. When Jazz spreaded, it reached the American middle class.

Jazz is considered a blend of African American traditional music along with white middles class society's traditions. Jazz culture significantly increased in American citiies such as New York and Chicago, there, several jazz musicians, particularly black musicians, used to playe in jazz clubs.  

because it took place after the war of 1812 had come to an end.