Who was the iconic figure known as the "King of Jazz" during the 1920s? a) Louis Armstrong b) Duke Ellington c) Benny Goodman d) Glenn Miller

The question is asking about a famous figure in the jazz music scene during the 1920s, who was known as the "King of Jazz". The options provided are all notable figures in jazz history, but the title "King of Jazz" is specifically associated with one of them.