Which sentence from the autobiography best explains the effect that the slaves' songs had on Frederick Douglass?

AI did not, when a slave, understand the deep meaning of the those rude and apparently incoherent songs

BThey would compose and sing as they went along, consulting neither time nor tune

CI have often utterly, since I came to the north, to find persons who could speak of the singing, among slaves, as evidence of there contentment

DThose songs still follow me, to deepen my hatred of slavery, and quicken my sympathies for my brethren in bonds