What effect do the rhyming couplets have on the speech of the central character

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."

one is a red flower, and one is the sky when the sun sets.