The correct answer is b. An appreciation on the art form.
"Jazz Fantasia" is a poem written by Carl Sandburg(1878-1967), who was born in Illinois. He was a journalist and a fan of folk music. Indeed, he had a vast collection of folk music.
Sandburg is also famous for poems like "Chicago Poems", "Somoke and Steel", "Fog", and "Abraham Lincoln. The War Years."
He won a Pulitzer prize in 1940.