How does Ellison continue to develop the invisibility motif as expressed at the end of Chapter 13?

this would be in the imperative mood. it is a category of verb forms that are used to express orders,instructions,commands or requests.

- "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."

i think that the answer is a