Read the excerpt from "the weary blues."

he made that poor piano moan with melody.
o blues!
swaying to and fro on his rickety stool
he played that sad raggy tune like a musical fool.
sweet blues!
coming from a black man's soul.
o blues!

the phrases “o blues! ” and “sweet blues! ” are examples of
a.)alliteration.
b.)repetition.
c.)hyperbole.
d.)simile.