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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!
In a deep song voice with a melancholy tone
I heard that Negro sing, that old piano moan—
"Ain't got nobody in all this world,
Ain't got nobody but ma self.
I’s gwine to quit ma frownin'
And put ma troubles on the shelf."

What is the effect of repeating the phrase “piano moan” in the poem?

A. It sets a sad, mournful tone.

B. It adds a cheerful, melodic chord.

C. It adds an open, musical sound.

D. It sets an angry, discordant tone.

Explanation: The tone of a story, poem or text is the author's attitude towards the audience, the subject or even the characters of the text. Repetition is a literary device that consists in repeating words or phrases in order to emphasize emotions or meanings. In the given excerpt from "The Weary Blues" we can see that the repetition of the phrase "piano moan" helps to set a sad and mournful tone.