Which of the sources in this activity is a primary source?

Primary sources include documents, photographs, letters, and other accounts that provide firsthand evidence about a historical event or time period. Since they are created contemporaneously with the historical events we study, analyzing primary sources expands my students' understanding of important events in history.

If thats what you mean

- "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."

what are you asking? this is gibberish.